A football player of mass 100 kg with a speed of 3.0 m/s collides head-on with a

Question

A football player of mass 100 kg with a speed of 3.0 m/s collides head-on with another football player of mass 85 kg who was initially moving in the opposite direction with a speed of 5.0 m/s. The second player tackles the first and they become entangled into the equivalent of a single mass.
a. What is the magnitude of the velocity of the two players after the collision? (2 points)
b. Describe the direction both of them ended up going. (1 point)
7. A ball dropped on a surface from a 2 m height bounces to a height of 0.98 m. What is the coefficient of restitution between ball and surface? (1 point)

Explanation / Answer

a)as momentum remains conserved:

final velocity=(85*5-100*3)/(100+85)=0.67568 m/s

b)direction will be along the direction of motion of 85 kg player.

c)coefficient of restitution=sqrt(0.98/2)=0.7

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