Question

A ball is thrown straight up from the edge of the roof of a building. A second ball is dropped from the roof a time of 1.17 s later. You may ignore air resistance

A.

If the height of the building is 20.3 m, what must the initial speed be of the first ball if both are to hit the ground at the same time?

Express your answer in meters per second.

B.

Consider the same situation, but now let the initial speed v0 of the first ball be given and treat the height h of the building as an unknown. What must the height of the building be for both balls to reach the ground at the same time for v0_0 = 8.80 m/s.

Express your answer in meters.

C.

If v0v0 is greater than some value vmax, a value of h does not exist that allows both balls to hit the ground at the same time. Solve for vmax.

Express your answer in meters per second.

D.

If v0 is less then some value vmin, a value of h does not exist that allows both balls to hit the ground at the same time. Solve for vmin.

Express your answer in meters per second.

Answer #1

A
ball is thrown from the roof of a building. The initial velocity
vector is at an angle of 53.0° above the horizontal. It is at
maximum height in 1.04 seconds. Express all vectors in terms of
unit vectors i and j. The ball strikes the ground at a horizontal
distance from the building of 33.1 meters.
a.) What is the vertical velocity (vector) at t=1.04
seconds?
b.) What is the initial vertical velocity (vector)?
c) What is the inital...

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