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Question

A block of mass 4 kg hangs from spring of spring constant k=400 N/m. The block is pulled down through 15 cm below and released. What is the kinetic energy when the block is 10 cm above the equilibrium position ?

A
5 J
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B
2.5 J
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C
1 J
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D
1.9 J
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Solution

The correct option is B 2.5 J
1481659_1223304_ans_a91f5561803549f68bff684f0efc92f3.jpg

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