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A sphere A, of mass 3 kg, is moving on a smooth horizontal floor with speed 4 ms–1 in...

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saj-94 | (Level 1) Salutatorian

Posted August 8, 2013 at 4:16 PM via web

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A sphere A, of mass 3 kg, is moving on a smooth horizontal floor with speed 4 ms–1 in a direction which is at right-angles to a smooth vertical wall. The sphere strikes the wall and rebounds with a speed of 2·8 ms–1.

Determine the magnitude of the impulse exerted by the wall on the sphere during the impact.

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justaguide | College Teacher | (Level 2) Distinguished Educator

Posted August 8, 2013 at 4:30 PM (Answer #1)

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The sphere with mass 3 kg, is initially moving on a smooth horizontal floor with speed 4 m/s. in a direction which is at right-angles to a smooth vertical wall. It sphere strikes the wall and rebounds with a speed of 2.8 m/s

The impulse on the ball by the wall is equal to the change in momentum of the ball. The initial momentum is 3*4 = 12 kg*m/s. And the momentum of the ball after it strikes the wall is -2.8*3 = -8.4. The change in momentum is 20.4

The impulse produced by the wall is equal to 20.4 kg*m/s

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