- #1

- 48

- 0

The first question is "what is the loss in mechanical energy" and I get 56J, which is right according to my teacher. However, the second question is "what is the coefficient of kinetic friction between the 4 kg block and the rough surface?"

What I do is:

Loss in mechanical energy = energy of friction

Thus:

56 = Fd =

56 = umgd =

56 = u * 4 * 9.8 * 3m

and I get .47. However, the answer is .40. What am I doing wrong?