A weight lifter picks up a barbell and

1. lifts it chest high

2. Holds it for 5 minutes

3. puts it down.

Rank the amounts of work W the weight lifter performs during these three operations. Label the quantities as W₁, W₃, and W₃. Justify your ranking order.

Estimate the amount of work performed on a 1200 kg car as it accelerates at 1.2 m/s² over a 150 meter distance.

One farmer is bragging about his strong horse and his neighbor is proud of his powerful horse.

If these men are giving the words strong and powerful their correct physical meaning, what can you say about the two horses?

A good, professional baseball pitcher throws a ball straight up in the air. Estimate how high the ball will go. ( A good throw can reach 90 mph.)