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physics

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A 50. kg cart is moving across a frictionless floor at 2.0 m/s. A 70. kg child, riding in the cart, jumps off so that the child hits the floor with zero velocity. What was the velocity of the cart after the boy jumped?

  • physics - ,

    (M1+M2)V1=M1Vf+M2*0

    conservation of momentum.

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