Throwing Caution to the Wind,Bob Hops Off a Bridge onto a Small

Multiple Choice

Throwing caution to the wind,Bob hops off a bridge onto a small boat that is travelling under the bridge at 12.0 m/s.If Bob's mass is 85.0 kg,and the boat's (with its driver) is 451 kg,how fast is the boat moving after Bob lands on it? Assume Bob falls straight down into the boat.

A) 9.7 m/s
B) 10.1 m/s
C) 11.0 m/s
D) 14.3 m/s