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A 45 kg boy is running eastward at 4.0 m/s when he jumps onto a 15 kg sled. a) What is the velocity of the

A 45 kg boy is running eastward at 4.0 m/s when he jumps onto a 15 kg sled.

a) What is the velocity of the boy and sled, if he hangs on?

b) If the average acceleration due to the snow is 0.35 meters per seconds squared [W], how long does it take for the boy and the sled to come to a stop?

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