a 500 g ball moves in a verticle circle on a 1.01 m long string. if the speed at the top is 4.3 m/s, then the speed at the bottom will be 7.62 m/s. what is the tension of the string when the ball is at the top? when is the tension of the string when the ball is at the bottom?
tension = (Fnet)=mv2/r
The Attempt at a Solution
tension = (Fnet)=(0.5 kg)(4.3)2/(1.01) = 9.15 N
tension = (Fnet)=(0.5 kg)(7.62)2/(1.01) = 28.7 N
these answers are wrong, however. and i'm not exactly sure why.
pointers in the right direction would be much appreciated!