Problem 8.31 A 0.26-kg rock is thrown vertically upward from the top of a cliff

Question

Problem 8.31

A 0.26-kg rock is thrown vertically upward from the top of a cliff that is 32m high. When it hits the ground at the base of the cliff, the rock has a speed of 30m/s .

Part A

Assuming that air resistance can be ignored, find the initial speed of the rock.

Express your answer using two significant figures.

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Part B

Find the greatest height of the rock as measured from the base of the cliff.

Express your answer using two significant figures.

SubmitMy AnswersGive Up

Problem 8.31

A 0.26-kg rock is thrown vertically upward from the top of a cliff that is 32m high. When it hits the ground at the base of the cliff, the rock has a speed of 30m/s .

Part A

Assuming that air resistance can be ignored, find the initial speed of the rock.

Express your answer using two significant figures.

SubmitMy AnswersGive Up

Part B

Find the greatest height of the rock as measured from the base of the cliff.

Express your answer using two significant figures.

SubmitMy AnswersGive Up

Explanation / Answer

16.5 m/s
13.87 m
Do it by formula
v2 = u2 + 2gs

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