1 A 65 kg firefighter climbs a flight of stairs in 3. 0 seconds . The vertical height of the stairs is 4 meter aj Estimate the firefighters power output in watts' and horsepower by How much energy is required . ! 2 1 9 ) Determine the work a hiker must do on a 15 kg backpack to carry it up a hill of height is 10meter 6) Determine the workdone by gravity on the backpack ") The networkdone on the backpack Note : Submit on time, show free body diagram