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A sled of mass 9.0 kg is sliding across a frozen lake with a speed of 5.0 m/s. A package of mass 4.0 kg is dropped onto it from above. Assuming there is no friction between the sled and the lake, what is the new speed of the sled?

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By the law of conservation of momentum,
m1v1 = m2v2
9 * 5 = (9+4) v2
v2 = 45/13

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