A rock is thrown vertically upward from the ground with an initial speed 15m/s.

A. How high does go
B. How much time is required for the rock to reach its maximum height?
C. What is the rock's height at t=2.00s?

It's all a matter of applying the various equations of motion:

A. Use

You've been given the rock's initial velocity, and you know the rock's velocity at its highest point is 0. Set a = g = -9.8m/s, and solve for d.

B. Use and solve for t.

C. Use .

Post back with your answers and we'll check it for you.