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a. at what height above the ground does the ball start to move?

b. what is the speed of the ball when it leaves the track?

c. what is the speed of the ball when it hits the ground?

is there even enough information to solve this equation??

i tried setting the equation up as mgh= .5mv^2 but i end up with 2 variables...i don't know what to do from there. please help!