I have this issue:
If you push a 40.0 kg crate at a constant speed of 1.40 m/s across a horizontal floor (µk=0.25 ), at what rate (a) is work being done on the crate by you and (b) is the energy dissipated by the frictional force?
For starters, here is what I have so far:
RN = mg = 40*9.8 = 392 N
Ff = muRN = 0.25*392 = 98 N
KE = 0.5mv^2 = 0.5*40*(1.40)^2 = 39.2 J
At this point, I don't know how to answer part (a). If W = FD , how do I find the work being done without a distance?