A weight lifter lifts 400 pounds a distance of two feet in two seconds using a weight bar. A small child lifts 400 pounds a distance of two feet by lifting 4 pounds bricks one at a time and repeats this one hundred times. Who exerted more power

A40 kilogram skier starts at the top of a 12 meter heigh slope. at the bottom she is traveling 10 meters per second how much does she lose to friction? a. 4,704 joules b. 2,704 joules. c.2,000 joules d. she doesn’t lose any because mechanical energy is conserved. 35