pls solve all them

Name: Unit 8:3 Period: Is work positive, negative, or zero? An object falls from A to D. What kind of energy before? B An object speeds up. An object is lowered back to the ground. What kind of energy after? Friction slows down an object. Put these together into the Law An object slides down a ramp without friction. of Conservation of Energy. An object is lifted up from the ground. An object is thrown into the air without friction. 1 . Ep = Ek A. A moving object stops. Find the energy of the 2 kg object at A. 2. Ek = Ep B. An object at rest is moved by a 0 m/s force. C 3. Ekbefore + W = Ekafter C. An object is thrown into the air. Ep at C = 4.0 + W = Ekafter D. A force speeds up an object. Ek at C = B h 5. Ekbefore -W = Ekafter E. An object slows down. Ek at B = 3 m/s - A 1/2h Ep at B = 6. Ekbefore -W = 0 F. An object is lowered to the 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 IT! D) Was work done? 4 kg 3 m E) Put the above into the Law of Conservation of Energy. 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 =