Question

while playing football,peter(mass=40kg)& steve (mass= 60 kg) got entangled when they came running from opposite direction if their velocities were 3m/s & 4m/s resp. find the velocity & direction of both players after collision​

Answer 1

Answer:

Explanation:

Peter's momentum before collision: mass(P) x velocity(P1)

= 40 x 3

= 120

Steve's momentum before collision: mass(S) x velocity(S1)

= 60 x 4

= -240(minus stands for opposite direction)

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Peter's momentum after collision: mass(P) x velocity

= 40 x v

Steve's momentum after collision: mass(S) x velocity

= 60 x v

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By law of conservation of momentum, initial total momentum = final total momentum,

120 + (-240) = (40 x v) + (60 xv)

-120 = 40v + 60v

$-120=100v\\ v=-120/100\\.:v=-1.2ms^-^1$

Hence, their velocity will be 1.2 m/s

The minus states that the direction of players will be in Steve's direction.