Fred (mass 70.0 kg) is running with the football at a speed of 7.10 m/s when he is met head-on by Brutus (mass 130 kg), who is moving at 5.10 m/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 0.350. Give answer in cm.
m1 = 70 kg
m2 = 130 kg
u1 = 7.10 m/s
u2 = -5.10 m/s (-ve sign: opposite direction)
m = m1 + m2 = 200 kg
By momentum ...
The solution walks the reader through the calculations taken to find the coefficient of kinetic friction between football uniforms and astroturf after a head-on collision between players where their speed and masses are given.