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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