A skateboarder (m = 85 kg) takes a running jump onto a friend’s skateboard that is initi...

A skateboarder (m = 85 kg) takes a running jump onto a friend’s skateboard that is initially at rest as sketched in Figure P7.37. The friend is standing on the skateboard (mass of friend plus skateboard = 110 kg). After landing on the skateboard, the velocity of the board plus the two skateboarders is 3.0 m/s. What was the horizontal component of the velocity of the jumping skateboarder just before he landed on the skateboard?