Question

A 1.25 kg skateboard is coasting along the
pavement at a speed of 5.04 m/s when a 0.640
kg cat drops from a tree vertically downward
onto the skateboard.
What is the speed of the skateboard-cat
combination?
Answer in units of m/s Your answer must
be within ± 1.0%

Answer 1

conserve momentum:

1.25*5.04 = (1.25+0.640)v

Answer 2

sadf