A 50.0 kg child is riding in a 120.0 kg bumper car at an amusement park. The child drives the bumper car at 4.5 m/s head-on into the wall of the ride and rebounds at 1/3 the speed. What is the magnitude of the change in momentum of the child in the bumper car? A. 375 kg•m/s
B. 510 kg•m/s
C. 720 kg•m/s
D. 1020 kg•m/s

What is the coefficient of kinetic friction μk between the block and the tabletop?

Agirl throws a ball. if the ball's acceleration is 12 m/sec/sec and its mass is 0.5 kg, how much force did the girl apply to the ball?

Acharge q experiences no net force at a particular point in space. which of the following situations described below must always be true? -there are no other charges nearby. -if there are other charges nearby, they must all have the same sign as q. -if there are other charges nearby, they must all have the opposite sign of q. -if there are other charges nearby, the total positive charge must equal the total negative charge. -none of the above