Fred (mass 63kg ) is running with the football at a speed of 5.8m/s when he is met head-on by Brutus (mass 130kg ), who is moving at 4.1m/s . Brutus grabs Fred in a tight grip, and they fall to the ground.
How far do they slide? The coefficient of kinetic friction between football uniforms and Astroturf is 0.30.