Question

b) If both cars from the previous question started from the
same position, at what time would they have the same displacement?
What is the displacement of the vehicles?

c) A truck covers 40 m in 8.5 seconds while smoothly slowing
down at a constant rate ( acceleration is constant) to a final
speed of 2.8 m/s. Solve for the truck's original speed and it's
acceleration.

d) You are cruising at a speed of 60 mph (26.8 m/s} when a
deer appears 100 m ahead of you. What is the maximum time you have
to stop and what acceleration do you need to have to avoid hitting
the deer?

Answer #1

Two cars start from rest at the same location and at the same
instant and race along a straight track. Car A accelerates at 6.6
f/s^2 to a speed of 90 mph and then runs at this constant speed.
Car B accelerates at 4.4 f/s^2 to a speed of 96 mph and then runs a
constant speed.
(a) Which car will with a 3-mile race and by what distance?
(b) What will be the maximum lead of A over B?...

1. Starting from rest, it took you 12 seconds to accelerate your
car to 24 m/s at a constant acceleration. Find your
acceleration.
2.A prototype car starts from rest and accelerates at a constant
rate to 60 m/s in 5.1 seconds. How much distance did the car travel
during the 5.1-second accelerated motion?
3. A speeding driver noticed a police car parked about 443 m in
from of him on the side of the road and reduced his speed at...

In a quarter-mile drag race, two cars start simultaneously from
rest, and each accelerates at a constant rate until it either
reaches its maximum speed or crosses the finish line. Car A has an
acceleration of 10.6 m/s2 and a maximum speed of 104
m/s. Car B has an acceleration of 11.7 m/s2 and a
maximum speed of 87.5 m/s. (a) Which car wins the
race? (b) By how many seconds does this car win
the race?

At t = 0, one toy car is set rolling on a straight track with
initial position 17.0 cm, initial velocity -2.7 cm/s, and constant
acceleration 2.70 cm/s2. At the same moment, another toy car is set
rolling on an adjacent track with initial position 9.5 cm, initial
velocity 5.30 cm/s, and constant zero acceleration.
(a) At what time, if any, do the two cars have equal speeds?
(Enter NA if the cars never have equal speeds.) s
(b) What...

1. Motion of an object depends on its velocity only.
True
False
2. A car with a mass of 2500 kg is traveling at a speed of 30 m/s
due east. Choose the most appropriate answer to its momentum.
a. 30 m/s due east
b. 30 m/s
c. 75,000 kgm/s
d. 75,000 kgm/s due east
3. A car is traveling at 70 mph and then is involved in an accident
with a head-on collision into a very solid wall. As...

can someome answer these please?
A runner jogs one lap around the track that encircles a
football field (and, if it were me, would immediately collapse). If
she ends where she began, and the distance is one-quarter mile,
what is the displacement of the jogger?
A rocket is fired from the launch pad, obtaining a speed of
650 m/s in 7.0 seconds. What is the average acceleration of the
rocket? Round to the nearest integer.
A coyote, closely related to...

Suppose the two cars had rubber
bumpers in the front and back – similar to the bumper cars children
(of all ages!) ride at amusement parks. Also, suppose that the cars
are sturdy enough that the metal they are made of does not bend
during the collision. In this case, the cars would undergo a
perfectly elastic collision. Assume just like in the first
collision question that the SUV (initially moving to the right)
collides into the stationary smart car....

1. A 25 kg skydiver has a speed of 20 m/s at an altitude of 350
m above the ground. Determine the kinetic energy possessed by the
skydiver.
2. If a cruise ship travels 150 km to the south and then 250 km to
the west, what is the ship’s displacement from its starting
point?
3. A train is accelerating at a rate of 5 m/s . If its initial
velocity is 15 m/s, what is its speed after 10...

Two boxes are stacked, with box B placed on top of box A. If box
A is pushed such that both boxes move with a decreasing speed, is
there any friction on either box?
(a) Kinetic friction on box A and no friction on box B (b)
Kinetic friction on box A and static friction on box B
(c) Kinetic friction on box A and kinetic friction on box B (d)
Static friction on box A and kinetic friction on...

12. Through what angle in degrees does a 31 rpm record turn in
0.27 s
13. Starting from rest, the same torque is applied to a solid
sphere and a hollow sphere. Both spheres have the same size and
mass, and both are rotating about their centers. After some time
has elapsed, which sphere will be rotating faster?
answer choices:
a. hollow sphere
b. They will be rotating equally fast
c. solid sphere
14. In movies, it often happens that...

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