4. How far can a mother push a 20.0 kg baby carriage, using a force of 62.0 N at an angle of 30.0º to the horizontal, if she can do 2920 J of work?
5. How much work is it to lift a 20. kg sack of potatoes vertically 6.5 m?
6. If a small motor does 520. J of work to move a toy car 260. m, what force does it exert?
7. A girl pushes her little brother on his sled with a force of 300. N for 750. m. How much work is this if the force of friction acting on the sled is (a) 200. N, (b) 300. N?
8. A 75.0 kg man pushes on a 5.0 x 105 ton wall for 250 s but it does not move. How much work does he do on the wall? (2000 lb = 1 ton; 0.454 kg = 1 lb)
9. A boy on a bicycle drags a wagon full of newspapers at 0.800 m/s for 30.0 min using a force of 40.0 N. How much work has the boy done?
10. If it takes 25 N to slide the box up the ramp, how much work will it take to slide the box up?
11. Instead of sliding, how much work will it take to lift the box to the top of the ramp?