A 63 kg kid is skateboarding at 12 m/s. A 0.625 kg basketball is thrown at him. After impact, the skateboarder slows down to 6 m/s and the basketball bounces away at v = 2 m/s. How fast was the basketball traveling on impact?

since you're a real machine, your ama is always less than your ima, because you can never totally eliminate friction.

multiple

you go to your settings preference and in the end youll see sth that says "i want to delete my acc" click on it and u'll acc will be deleted but u have to wait.