fter jumping up and down on a diving board, Roger jumps off the diving board. Ha

Question

fter jumping up and down on a diving board, Roger jumps off the diving board. Hakim claims that Roger does work on the diving board because he supplies energy to it. Ludmilla claims that the diving board does work on Roger and supplies energy to him. Which one, if either, is correct? a. Hakim, because the diving board is deformed and vibrated like a spring when Roger jumps. b. Ludmilla, because Roger jumps up in the air above the diving board. c. Neither, because Roger's muscles do all the work. d. Both, because Roger's muscles do all the work. e. Neither, because the diving board does all the work. Positive work can be done a. by friction when a car is accelerating without skidding. b. by a spring when it launches a clown in the air. c. by a hand throwing a ball. d. by all of the above. e only by (b) and (c) above.

Explanation / Answer

Part A Solution:

Option A is correct "Hakim, because the diving board is deformed and vibrated like a spring when Roger jumps off"

because roger is the only external force here, being applied to the diving board, his continuous jumping deformes the board and Roger's Kinetic Energy is only changing here.

PART B Solution:

Positive Work can be done by "a spring when it launches a clown in the air" and " by a hand throwing a ball"

so option E is correct.

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