A block falls vertically onto a vertical spring. While the spring is being compr

Question

A block falls vertically onto a vertical spring. While the spring is being compressed by the block, the spring is doing ____ work on the block and gravity is doing ____ work on the block. Why?
Answers: A. zero; positive B. positive; negative C. negative; negative D. positive; zero E. negative; positive. A block falls vertically onto a vertical spring. While the spring is being compressed by the block, the spring is doing ____ work on the block and gravity is doing ____ work on the block. Why?
Answers: A. zero; positive B. positive; negative C. negative; negative D. positive; zero E. negative; positive. A block falls vertically onto a vertical spring. While the spring is being compressed by the block, the spring is doing ____ work on the block and gravity is doing ____ work on the block. Why?
Answers: A. zero; positive B. positive; negative C. negative; negative D. positive; zero E. negative; positive.

Explanation / Answer

Spring applies restoring force towards the block (upward), while it is getting compressed (displacedment is downwards). So, force of the spring and displacement are happening in opposite directions, thus spring does negative work on the block.

On other hand, gravity acts downwards on the block and also the displacement is downward, therefore, gravity does positive work on the block.

Hence, option 'E' is correct.

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