Question

a 160 kg lineman moving west at 2 m/s tackles an 88 kg football fullback moving east at 5 m/s. after the collision, both players move east at 2 m/s

Answer 1

320 kg.m/s is the momentum of lineman (p)lineman =mv and 440 kg.m/s is the momentum of football fullback (p)fullback =mv.

What is change in momentum after collision?

Whenever to body collides there is no change in the momentum of the body as momentum of body is equal to the momentum before the collision to the momentum after the Collison.

As per the given data:

Mass of lineman=  160 kg

velocity  of lineman=2m/s

mass of fullback=88 kg

velocity=5 m/s

now momentum of lineman (p)lineman =mv

(p)lineman =160*2

(p)lineman =320 kg.m/s

now momentum of football fullback (p)fullback =mv

(p)fullback =88*5

(p)fullback =440 kg.m/s

now both travelling towards each other so final momentum after collision = 440-320

=120 kg.m/s

hence, the final momentum = 120 kg.m/s after collision .

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