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A traveler stands on ice close to the North Pole. The ice has zero friction. Hethrows a tennis ball of mass 112 g straight to the left with a speed equal to 18.0m/ s. His speed after he throws the stone equals 0.0282 m / s. What is his mass?

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conserve momentum. Since before the throw, the total momentum of the system is zero, just solve for m in
18 * 0.112 = 0.0282m
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