# physics

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A tennis player places a 54 kg ball machine on a frictionless surface. The machine fires a 0.057 kg tennis ball horizontally with a velocity of 38 m/s toward the north. What is the final velocity of the machine?

m/s to the south

• physics -

momentum is conserved.
Massmachine*veloctitymachine=-massball*velocityball

velocitymachine=-.057/54 * 38 North

and of course, -North is South

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