A 25-Kg Boy Jumps Off of a Raft (M =

Multiple Choice

A 25-kg boy jumps off of a raft (m = 92 kg) .If the boy jumps off at a speed of 4.40 m/s relative to the lake and the raft moves in the opposite direction with a speed of 1.2 m/s,find the mass of his friend who remains seated on the raft.Ignore the effects of water resistance.

A) 22 kg
B) 38 kg
C) 112 kg
D) 130 kg
E) 0 (He only has an imaginary friend on the raft.)