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A ball is thrown up and someone catches it on the cliff, what is the change in potential energy?

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A ball is thrown up and someone catches it on the cliff, what is the change in potential energy?

(a) Positive

(b) Negative

(c) Zero

(d) Cannot say

This question was posed to me in an interview for job.

The doubt is from Potential Energy and Kinetic Energy topic in division Introduction to Energy Balances for Processes without Reaction and Calculation of Enthalpy Changes of Basic Chemical Engineering

1 Answer

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Correct answer is (a) Positive

To explain I would say: Change in potential energy will be positive as the change in kinetic energy will be negative.

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