pls solve all them

O. EKbefore - W ground. A 5 kg rock is 8 m above the ground. Calculate its energy 7. Epbefore -W = 0 G. An object falls. If you had an efficiency greater than 100%, what would be greater Win or Wout? If it falls Ekbottom = Why is this not possible? Half-way down, Ek = A 4 kg rock is dropped from 5 m. There is no friction. A) What kind of energy does it have before? Ebefore = B) What kind of energy does it have after? Eafter = C) Does Ebefore = Eafter 30 N D) Was work done? E) Put the above into the Law of Conservation of Energy. 4 kg 8 m What is Win? What is Wout? F) Solve for the speed of the object at the bottom. Calculate Win. Calculate Wout. Calculate Efficiency. An 8 kg box at rest on the ground is pushed by a force for 12 m. The box ends up going 3 m/s (and there is no friction). A) Ebefore = B) Eafter = A 8 kg box at rest is pushed for 10 m with a 60 N force. If it is accelerated to 10 m/s. Calculate the efficiency of the force. C) Does Ebefore = Eafter? D) Put the above information into the Law of Conservation of Energy equation. E) Solve for the force. cstephenmurray.com Legal copying of this worksheet requires written permission. Copyright @ 2007, C. Stephen Murr