I used f=ma to get 99.2N then I used W=fd to get 9920J. This energy is the output, so output/0.25=input. To get a final answer of 3.97 x 10^4 J This is correct?
I used √2gh = v to get velocity (6.3 m/s) then used that in Ek = 1/2 m v^2 to get a final kinetic energy of 690 J. Would this be the correct way to do this?
For:
a) Avdol did the work because he is the force that is causing the displacement, right?
b) Is there another formula we would have to use? I am confused at how this would work out and what the answer would be.