A small block of mass m slides along a s...

A small block of mass `m` slides along a smooth frictionless track as shown.
(a) If it starts from rest at `P`, what is the resultant force acting on it at `Q`?
(b) At what height above the bottom should the block be released so that the force it exerts against the track at the top of the loop equals its weight?

`sqrt(75)mg,3R`

`sqrt(65) mg,2R`

`sqrt(75)mg, 2R`

`sqrt(65)mg,3R`

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