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Hi.

Two small balls A and B have masses 0.5kg and 0.2 kg respectively. They are moving towards each other in opposite directions on a smooth horizontal table when they collide directly. Immediately before the collission, the speed of A is 3m/s and the speed of B is 2 m/s. The speed of A immediately after the collision is 1.5 m/s. The direction of motion of A is unchanged as a result of the collision.

By modelling the balls as particles, Find;

(a) the speed of B immediately after the collision.

(b) the magnitude of the impulse exerted on B in the collision.

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For part (a) i am getting 2.3 m/s.. however my teacher's worked solution is giving 1.75 m/s.... now.. i dont know which one is correct...

for part B... i use Ft=mv-mu and get -0.75 ... i think im wrong....

Please help me out here.

Thanks

Faraz

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# Homework Help: Mechanics Question of two balls

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