http://www.estiloskateboards.com/speed-skateboard/
A 1.2 kg skateboard is coasting along the pavement at a speed of 5m/s when a .8kg cat drops from a tree?
If the cat lands on the skateboard what is the speed of the skateboard-cat combination?
Horizontal momentum is conserved.
Initial horizontal momentum is the cats (0) + the skateboard’s (1.2 kg * 5.0 m/sec) = 6 m-kg/sec
final horizontal momentum is 2.0 kg * s, where s is the speed of the athletic cat.
2s = 6
Speed s = 3.0 meters/sec
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