Find his acceleration as he comes to rest on the pad

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A pole-vaulter is nearly motionless as he clears the bar, set 4.2 meter above the ground. He then falls onto a thick pad. The top of the pad is 80 centimeter above the ground, and it compresses by 50 centimeter as he comes to rest.
Find his acceleration as he comes to rest on the pad?

Reference no: EM13675607

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