Question

A 100 gram apple falls from a branch that is 2.5 meters above the ground. -How much time elapses before the apple hits the ground? -Just before the impact, what is the speed of the apple? Please explain.

Answer #1

time to fall t = (2h/g) ^1/2

= (2 * 2.5 /9.8)^ 1/2

= 0.714 s

speed of the apple after reaching the ground v = vo + gt = 0 + gt = gt

v = 9.8 * 0.714

= 7 m/s

A 150 gram projectile is fired horizontally from a height of 25
meters above the ground. If the projectile travels 40 meters
horizontally before it hits the ground, what is the velocity of the
projectile right before hitting the ground?

A 2.5 kg hammer falls from a scaffold on a
building 60.0 m above the ground.
(a) Find its potential energy before it
falls.
(b) If all the potential energy was converted to kinetic energy,
find the speed of the hammer as it hits the ground.
(c) Find its kinetic energy the instant before it hits the
ground.

A baseball (a projectile) is launched from a height of 2 meters
above the ground at a speed of 34 m/s at an angle of 22 degrees
above the horizontal. The ball is directly hit a fielder who will
catch the ball and the fielder is initially 91 meters from point
where the baseball is hit (home plate). If his reaction time is
0.40 seconds (time before he starts to move), what is the minimum
speed he much run, in...

A
4kg cannonball falls 3m to the ground. How fast will it be moving
just before it hits the ground?

A 1.2kg coconut is hanging from a vine at a height of 2 meters
above the ground. When the coconut is dropped it swings down and
hits a .8kg lemur, who sticks to the coconut. The coconut then
continues its arc up the other side.
a. What is the speed of the coconut before it hits the
lemur?
b. What is the speed of the coconut and lemur after the
collision?
c. If the lemur wants to reach a persimmon...

A projectile is shot from the edge of a cliff 100 m above ground
with an initial speed of 50.0 m/s at an angle of 26° below the
horizontal. How much time does it take the projectile to hit the
ground?

A projectile is shot from the edge of a cliff 115 m m above
ground level with an initial speed of v0 v 0 = 54 m/s m / s at an
angle of 35.0∘
A) Determine the time taken by the projectile to hit point P P
at ground level.
B)Determine the distance XX of point PP from the base of the
vertical cliff.
C)At the instant just before the projectile hits point PP, find
the horizontal and the...

One day while Sir Isaac Newton was contemplating gravity
underneath an apple tree. An apple of mass 0.12 kg located 2.5 m
above the ground and directly above his head happened to fall.
*Note: Show all of your work/calculations
(a) If during the fall the apple lost 1.8 J of potential energy
before hitting Newton's head, how high above the ground was the top
of his head located?
(b) What was the speed of the apple just before hitting Newton's...

A hot-air balloon is rising straight up with a speed of 4 m/s. A
ballast bag is released from rest relative to the balloon at 13 m
above the ground. How much time elapses before the ballast bag hits
the ground?

Tarzan (an 80-kg man) is standing at rest on a tree branch 20
meters above the ground. Jane (a 40-kg woman) is standing at ground
level. Tarzan swings on a hanging vine from the tree and reaches
ground level at the very bottom of his swing, where he grabs Jane
and they continue the swing (upward again) together. How high off
the ground do the two reach? (Hint: what kind of collision do the
two have?

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 7 minutes ago

asked 8 minutes ago

asked 9 minutes ago

asked 9 minutes ago

asked 11 minutes ago

asked 15 minutes ago

asked 15 minutes ago

asked 19 minutes ago

asked 19 minutes ago

asked 21 minutes ago

asked 25 minutes ago

asked 29 minutes ago