A 500 g block slides down a frictionless inclined plane. At the bottom, a vertical circular loop with radius 67 cm is in the block’s path. From what height would the block need to be released to successfully complete the loop without losing contact with the surface of the track?
What i did is:
mv^2/r=T+mg
v=sr(T+mg)r/m
But i don't know what T is, help.