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Two spheres A and B, of equal radii, lie at rest on a smooth horizontal table. Sphere A...

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saj-94 | (Level 1) Salutatorian

Posted July 29, 2013 at 1:09 PM via web

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Two spheres A and B, of equal radii, lie at rest on a smooth horizontal table. Sphere A has mass 2m kg and sphere B has mass 16m kg. Sphere A is projected with speed 3 ms–1 towards sphere Band collides directly with it. The coefficient of restitution between A and B is 0.5 Determine the magnitude and direction of the impulse exerted by B on A, stating your units.

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aruv | High School Teacher | (Level 2) Valedictorian

Posted July 29, 2013 at 4:17 PM (Answer #1)

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By def of  coefficient of restitution say `mu`

`mu=v/u`  v is the velocity after collision and u is velocity before collision.

Thus

`.5= v/3`

`v=1.5ms^(-1)`  in the same direction in which sphere was projected.

Since impulse is defined as rate of change of momentum,therefore

Impulse=`2.0xx10^6xx(1.5-3)`

`=-3.0xx10^6`  N

momentum lost.

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