Posted by **Kayla V** on Wednesday, October 28, 2009 at 11:47pm.

Batman (mass = 95 kg) jumps straight down from a bridge into a boat (mass = 560 kg) in which a criminal is fleeing. The velocity of the boat is initially +10 m/s. What is the velocity of the boat after Batman lands in it?

- Physics -
**MathMate**, Thursday, October 29, 2009 at 9:07am
Assuming the criminal's weight is included in that of the boat (560 kg), calculate the initial kinetic energy using

KE0 = (1/2)Mv0²

Calculate the new kinetic energy

KE1 = (1/2)(M+m)v²

Equate KE0 and KE1 and solve for v.

- Physics -
**Mindy**, Tuesday, July 7, 2015 at 4:37pm
Or save yourself the trouble and use the following formula.

I just did this problem.

(m1*v01)/(m1+m2)

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