A physicist watches a slow motion video of a firecracker exploding. In this particular video, the firecracker splits into two pieces: one moving directly to the left, and the other directly to the right. The leftward moving piece has about 33% of the firecracker's original mass. The piece with the greater velocity must
be moving in which direction?

To practice problem-solving strategy 10.1 for energy conservation problems. a sled is being held at rest on a slope that makes an angle θ with the horizontal. after the sled is released, it slides a distance d1 down the slope and then covers the distance d2 along the horizontal terrain before stopping. find the coefficient of kinetic friction μk between the sled and the ground, assuming that it is constant throughout the trip.