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For 1), I calculated the work done by gravity by musing the formula Fd, so Wg = mgsintheta x d, so Wg = 167.6 J. I don't know how to do 2) For 3), I multiplied the external force by cos 20 and then by 5 m = 469.8 J For 4), the change in kinetic energy equals the work done by external force...

A block of mass 10 kg is pulled 5 m upwards along a rough surface at an angle of 20 deg, an external force of 100 N and vi = 1.5 m/s. The coefficient of friction is 0.4. Calculate: 1) The work done by gravity 2) The increase in internal energy between the block and the surface as a result of...