A 25-kg boy jumps off of a raft.If the boy jumps off at a speed of 3.90 m/s relative to the lake and the raft moves in the opposite direction with a speed of 1.0 m/s relative to the lake,find the mass of the raft.Ignore the effects of water resistance.
A)22 kg
B)78 kg
C)109 kg
D)120 kg
E)98 kg

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The Answer of A 25-kg boy jumps off of a raft.If the boy jumps off at a speed of 3.90 m/s relative to the lake and the raft moves in the opposite direction with a speed of 1.0 m/s relative to the lake,find the mass of the raft.Ignore the effects of water resistance.
A)22 kg
B)78 kg
C)109 kg
D)120 kg
E)98 kg

A 25-Kg Boy Jumps Off of a Raft