A 395.0 g block is dropped onto a vertical spring with a spring constant k = 252.0 N/m. The block becomes attached to the spring, and the spring compresses 0.29 m before momentarily stopping. While the spring is being compressed, what work is done by the block's weight?
What work is done by the spring?
What was the speed of the block just before it hit the spring?

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1. W(block) =kx²/2=252•0.29²/2=10.6 J
W(spring) = - 10.6 J
mv²/2 = kx²/2
v=x•sqrt(m/k)=
=0.29•sqrt(0.395/252) =0.0115 m/s

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posted by Elena

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