A water boy carries a cooler up a flight of stadium stairs. The cooler starts and ends at rest.
1. Cooler mass = 12 kg, stair height = 24 m, If the water boy starts halfway up the stairs, calculate the change in gravitational potential energy.
2. Cooler mass = 12 kg, stair height = 24 m, If the water boy starts halfway up the stairs, calculate the change in gravitational potential energy.
3. A 954 kg rocket sled is coasting at 24 m/s. It then turns on its rocket engines for 364 m, with a thrust of 1,071 N in the same direction as displacement. What is its final velocity?