Starting from rest, a 5 kg block slides 2.4 m down a rough 30 degree incline in 2 seconds. Find a) the work done by the force of gravity b) the change in mechanical energy due to friction(adsbygoogle = window.adsbygoogle || []).push({});

I'm stuck on where to start. For work, i'm using the equation w=fdcosx. I don't know what to use for f. Is the force just 9.8 or is it 9.8m? Or should i find the perpindicular force of the block? Thanks!

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# Homework Help: Force and Energy

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