Alexia is doing some injury prevention and power work in the high performance center.  In doing a drop jump, she drops from a set height of 0.4 m above the ground and then immediately jumps back into the air as high and as fast as she can. When Alexia leaves the ground to jump up, her vertical velocity is 3.9 m/s.  a) What impulse did Alexia experience while she was in contact with the ground, if her mass was 58 kg? b) What average net force acted on Alexia if she was in contact with the ground for 0.37 seconds? c) What was the maximum change in height experienced by Alexia's Centre of Gravity after she left the ground? d) What was the average reaction force (Force Normal) exerted upwards on Alexia by the ground during the 0.37 seconds?

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