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Tarzan swing on a 30m long vine initially inclined at an angle of 37 degrees with the vertical. What is his speed at the bottom of the swing a) if he starts from rest? b) if he pushes off with a speed of 4.0 m/s? I got part a, but am not sure how to do part b...

A rifle with a weight of 30N fires a 5 g bullet with a speed of 300 m/s. a.) Find the recoil speed of the rifle b.) If a 700-N man holds the rifle firmly against his shoulder, find the recoil speed of the man and the rifle. I need to know HOW to do this. I have the answers...the more detail...