Physics using linear eq. at constant acceleration?
1. A pole vaulter after crossing the bar lands on a foam cushion. His downward speed as first touches the cushion is 6.8m/s and he sinks 25cm into the cushion before stopping. Estimate the acceleration assumed constant,while being stopped by cushion.
Here are some possible formulas:
1. a=v2-v1/t
2.d=(v2+v1)t/2
3.d=v1t +atsquared/2
4.d=vsquared-vsquared/2a
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