Question a pole-vaulter is nearly motionless as he clears, Ask an Expert

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Question: A pole-vaulter is nearly motionless as he clears the bar, set 4.2m above the ground. He then falls onto a thick pad. The top of the pad is 80 cm above the ground, and it compresses by 50cm as he comes to rest.

Part A: What is his acceleration as he comes to rest on the pad?

Please provide any help for above question is greatly appreciated!

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