5) Two students stand poised to leap off a high divestructure into the swimming

Question

5) Two students stand poised to leap off a high divestructure into the swimming pool below. Student B is twice asmassive as student A. Which of the following is correct? Ignore airresistance. A ) Both students will have the same kinetic energyjust before impact. B ) Student B did twice as much work climbing to thetop of the structure. C ) Both students have the same weight. D ) Student B will reach the ground sooner than studentA. 5) Two students stand poised to leap off a high divestructure into the swimming pool below. Student B is twice asmassive as student A. Which of the following is correct? Ignore airresistance.

Explanation / Answer

By the energy-work theorem, the change in potential energy is equalto the work, so mgh is the total work done. Since g andh are the same for both of them, and m is twice as large forstudent B, student B did twice as much work. The answer is B.

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