One of the Kansas City Chiefs jumps up twice to celebrate the OT game winning touch down in the Super Bowl.  The player's mass is 108 kg and after completing the first celebratory vertical jump into the air, he lands on his feet and then immediately jumps up again to really celebrate the touch down.  When his feet first touch the grass after the first jump, his vertical velocity is -4.2 m/s downwards and when his feet leave the grass 0.5 seconds later, as he jumps back up a second time, his vertical velocity is 3.8 m/s upwards. a) What is the impulse exerted on player during this 0.5 seconds? b) What is the average net force exerted on the player during this 0.5 seconds? c) What is the average reaction force (Normal Force) exerted upward by the grass on the player's feet during this 0.5 seconds?

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