A 1.40 kg skateboard is coasting along the pavement at a speed of 5.5 m/s when a 0.800 kg cat drops from a tree vertically downward onto the skateboard. What is the speed of the skateboard-cat combination.

Answer 1

momentum is conserved.

in the direction of movement
1.4*5.5+.8*0= (1.4+.8)V

solve for V

Answer 2

3.26