Please help me on physics questions??

Posted on 2015-09-24 06:07:00 in Physics by HELEN

In the figure, a toy race car of mass m is released from rest on the loop-the-loop track. Its initial height is 2R above the floor. Friction can be neglected. What is the subsequent motion of the car? 



A.) The car falls off the loop when it reaches a height of 1.25 R. 



B.) The car falls off the loop when it reaches a height of 1.67 R. 



C.) The car successfully completes the loop and reaches the floor with a horizontal velocity of 2(gR)1/2. 



D.) The car falls off the loop when it reaches a height of 1.50 R. 



E.) The car falls off the loop when it reaches a height of 1.33 R.

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