Question

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 velocity of 21 m/s. Assume that g=-9.8010 m/s2. Upward direction is positive and downward is negative.

How long does it take, in seconds, to hit the ground?

3-A student standing on top of a 150-m high building threw a stone upward with an initial velocity of 50 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!)

4-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 distance, in meters, traveled by the stone during the first 10.5 seconds? (hint: it is not the displacement or location!)

Answer 1