Why is using a wheeled cart more efficient than dragging a suitcase?

How are calculation for velocity and speed different

What is the power rating of the lightbulb if 3.0 a flow through it when connected to a 15 v battery

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.