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The spring is compressed by a distance a...

The spring is compressed by a distance a and released. The block again comes to rest when the spring is elongated by a distance `b`. During this

A

work done by sprinn on the block `= (1)/(2)k(a + b)^(2)`

B

work done by sprinn on the block `= (1)/(2)k(a^(2) - b^(2))`

C

co-eff. of frication `= (k(a-b))/(2mg)`

D

co-eff. of frication `= (k(a+b))/(2mg)`

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The correct Answer is:
B, C
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