Recent content by RyanRhino

Sorry i forgot, the cos 20 is from the ramp of how it is 20 degrees above the horizontal we just pushed the box up the ramp

So F there i believe is Fa and that W would be the total work put in which would be Ein

I first wrote down that 55% = Eout/Ein I also know that W = (Facos20)(4) and I substitute it into the first equation 55% = Eout/[(Facos20)(4)] But I'm missing two variables here. Did i forget something or is the question missing some information?