Problem: A basketball player with a body weight of 850 N exerts a force of -4500 N against the ground during takeoff (jumping upward). The basketball player's average horizontal velocity was 10m/s during the takeoff period. The basketball player's foot was in contact with the ground for 0.5 s during the takeoff period.
Part A: How much force does the ground exert on the basketball player (ground reaction force) during the takeoff period?
I need help to find how much force the ground exerts on the basketball player (ground reaction force) during the takeoff period.