Question

While standing on a bridge 19.0 m above the ground, you drop a stone from rest. When the stone has fallen 3.50 m, you throw a second stone straight down. What initial velocity must you give the second stone if they are both to reach the ground at the same instant? Take the downward direction to be the negative direction.

Answer #1

While sitting on a tree branch 11 m above the ground, you drop a
chestnut. When the chestnut has fallen 2.6 m , you throw a second
chestnut straight down.
What initial speed must you give the second chestnut if they are
both to reach the ground at the same time?

1- A student standing on top of a 170-m high building threw a
stone upward with an initial velocity of 40 m/s. Assume that
g=-9.80 m/s2. Upward direction is positive and downward is
negative.
What is the vertical location of the stone in meters, with
respect to the top of the building, after 11.0 seconds? (hint: pay
attention to the sign here!)
2- A student standing on top of a 50-m high building threw a
stone upward with an initial...

Q1)A student standing on top of a 160-m high building threw a
stone upward with an initial velocity of 45 m/s. Assume that
g=-9.80 m/s2. Upward direction is positive and downward is
negative.
What is the speed, in m/s, of the stone after 5.0 seconds?
(hint: speed is always positive!)
Your Answer:
Q2)
A student standing on top of a 150-m high building threw a stone
upward with an initial velocity of 44 m/s. Assume that g=-9.80
m/s2. Upward direction...

1) On Planet #1, you drop a stone from rest, 94.9 m above the
ground, and the stone hits the ground 2.96 s later. What is the
value of g on Planet #1?
2)On planet #2, you launch a projectile straight up from the
ground at a speed of 32.6 m/s. The projectile reaches a maximum
height of 68.0 m before falling back to the ground. What is the
value of g for planet #2?
3)On planet #3, you fire...

1. A stone is thrown straight downward with initial speed of 4.1
m/s from a height of 86 m. What is the time it takes to reach the
ground?
2. You drop a stone into a 300 meter deep well. How long after
you will hear the sound of hitting? Sound velocity is given 334
m/s.
3. You throw a stone vertically upward from the roof of an 39 m
tall building with a velocity of 54 m/s. How long...

A stone is dropped into a river from a bridge 43.4 m above the
water. Another stone is thrown vertically down 1.91 s after the
first is dropped. Both stones strike the water at the same time.
What is the initial speed of the second stone?

A
stone is thrown from the top of a cliff with the initial velocity
of 20.0 m/s straight upward. The cliff is 50.0 m high and the stone
just misses the edge of the cliff on its way down. Determine (a)
the time needed for the stone to reach its maximum height; (b) the
maximum height, as measured from the ground; (c) the time needed
for the stone to return to the level of the thrower; (d) the
velocity of...

A stone falls from rest from the top of a cliff. A second stone
is thrown downward from the same height 3 . 2 s later with an
initial speed of 62 . 72 m / s. They hit the ground at the same
time.
(a) How long does it take the first stone to hit the ground? The
acceleration of gravity is 9 . 8 m / s 2 . Answer in units of
s.
(b) How high is...

You cast a pebble at 1.8 m/s at a pond from 0.7 m above ground.
How fast is it when it is about to land in the pond 0.9 m below the
ground?
Hint: use mechanical energy conservation. The direction of the
velocity is irrelevant. It doesn't have to travel straight up or
down. Pebble's final position is negative.

1. Physics and astronomy student club has a recently established
tradition of pumpkin drop, from the top of Wick Science Building to
the "moat" below street level. Although the "experimental data"
have not been made public, there have been rumors of the drop took
2.07 seconds, i.e. falling from rest with negligible air drag.
Based on the rumor, how tall is the building from the "moat" to the
roof?
Ignore air drag or any rotation of pumpkins.
Hint: You may...

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