Help on the second questio n only. I asked this question earlier but unfortunate

Question

Help on the second question only. I asked this question earlier but unfortunately received 0 responses.

A sled sits on the top of a frictionless hemisphere of radius R. You give the sled a tiny kick and its starts to slide down the hemisphere. What is the angle the sled makes with the vertical when it leaves the hemisphere? A ball falls down a looped track. What is the ball's original height if it never loses contact with the track? (What must its speed be at the very top of the track to stay on the track? The answer is not zero!)

Explanation / Answer

a) angle phi= (90-phi)

b) height of ball = h/R due to linear conservaton of momentum

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