Question

1.)You are hitting baseballs. When you toss the ball into the
air, your hand is 5 feet above the ground (see figure). You hit the
ball when it falls back to a height of 3.5 feet. You toss the ball
with an initial velocity of 20 feet per second. The height
*h* of the ball *t* seconds after leaving your hand
is given by

* h* = 5 + 20

How much time will pass before you hit the ball? (Round your answer to one decimal place.)

2.) A truck traveled the first 260 miles of a trip at one speed and the last 180 miles at an average speed of 5 miles per hour less. The entire trip took 7 hours. What was the average speed for the first part of the trip?

Answer #1

A ball is thrown across a playing field from a height of h = 5
ft above the ground at an angle of 45° to the horizontal at the
speed of 20 ft/s. It can be deduced from physical principles that
the path of the ball is modeled by the function
y= -(32/400)x^2+x+5
where x is the distance in feet that the ball has traveled
horizontally.
1) Find the maximum height attained by the ball. (Round your answer
to three...

You throw a ball for your dog to fetch. The ball leaves your
hand with a speed of 2 m/s, at an angle of 30◦ to the horizontal,
and from a height of 1.5 m above the ground. The mass of the ball
is 0.5 kg. Neglect air resistance in what follows.
(a) What is the acceleration of the ball while it is in flight?
Report it as a vector, that is, specify magnitude and direction (or
vertical and horizontal...

A boy uses a slingshot to launch a pebble straight up into the
air. The pebble reaches a height of 38.0 m above the launch point
1.0 seconds later. Assume air resistance is negligible.
(a) What was the pebble's initial speed (just after leaving the
slingshot)?
42.9 m/s
(b) How much time did it take for the pebble to first reach a
height of 19.0 m above its launch point?
? s
You toss a tennis ball straight upward. At...

You throw a ball for your dog to fetch. The ball leaves your
hand with a speed of 2 m/s, at an angle of 30◦ to the horizontal,
and from a height of 1.5 m above the ground. The mass of the ball
is 0.5 kg. Neglect air resistance in what follows.
(a) How high does the ball rise above the ground?
(b) What is the kinetic energy of the ball as it hits the
ground?
(c) Now let the...

A ball is thrown vertically upward from a height of 5 ft with an
initial velocity of 83 ft/s. The distance s (in feet) of the ball
from the ground after t seconds is s = s(t) = 5 + 83t − 16t^2. (a)
What is the velocity v, in feet per second, of the ball after 2
seconds?
(b) When, in seconds, will the ball reach its maximum height?
(Round your answer to one decimal place.)
(c) What is...

In order to obey social distancing requirements, you toss
(clean) supplies to your elderly next door neighbor during the
quarantine. Using an overhand throw, you launch a box of face masks
from an initial height of 1.89 ? above the ground. It reaches their
driveway a horizontal distance of 7.62 ? away in 1.30 ???????.
(8 points) What was the initial speed and angle of your throw?
Express your answer to 3 significant figures.
(5 points) If the tree branches...

1) A 85.0 kg football player leaps straight up into the air
(with no horizontal velocity) to catch a pass. He catches the 0.430
kg ball precisely at the peak of his jump, when he is 21.2 inches
off the ground. He hits the ground 1.11 inches away from where he
leapt. If the ball was moving horizontally when it was caught, how
fast was the ball travelling?
2)You would like to shoot an orange in a tree with your...

1)
A car is traveling at +15m/s when a constant acceleration of
-4m/s^2 (say a strong continuous wind opposite the initial
direction of motion) is applied. (Note: No friction and the car is
coasting before the wind starts.) 5 seconds later, what are the
position, velocity, and acceleration of the car?
2) A 0.44kg size 5 soccer ball is kicked from the top of a 20m
cliff with a velocity of 10 m/s at an angle of 35° with respect...

1.If a car's speedometer indicates a
constant speed of 30 miles per hour, can it be
say that the car is not accelerating?
2. Describe an example of something that has constant speed and at
the same time a
variable speed. Can you describe an example of something that has a
constant speed
and variable speed? Sustain your answers.
3.Describe an example of a
body experiencing acceleration when traveling rapidly
constant. Is it possible to describe an example of a...

I'm trying to check my work. I'm usually able to go to the
tutoring center and have some one look at it but with classes being
online I can't. Please help!
1) The muscles in a grasshopper's legs can propel the insect
upward at 3.3 m/s. How high can the grasshopper jump?
2) A jetliner touches down at 200 km/h , reverses its engines to
provide braking, and comes to a halt 24 s later. What's the
shortest runway on...

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