A student throws a rock from the top of a 50 meter cliff at time t = 0s, but thi

Question

A student throws a rock from the top of a 50 meter cliff at time t = 0s, but this time at some initial angle we don’t know. Assuming the rock moves with constant acceleration a = gyˆ, find a value for the change in its velocity v(that?s a vector – so the value has a magnitude and a direction). (a) How about now: Find a value for v from when the student throws it from the top of the cliff, y = 50m, to when it gets to a height of 30m. Is that enough information? If so, find the value. (b) Now try this: Forget what I said about the height in part (a), and instead find a value for v from t = 0s to t = 2s. Is that enough information? If so, find the value.

Explanation / Answer

In order to solve this problem, we should know at least the magnitude of the velocity at t=0 and the value of the initial angle

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