A 5 kg body is rotated in a vertical circle with a constant speed of 4 ms–1 using a string of length 1 m, when the tension in the string is 31N, then the body will be

Centrigugal force = mV2 / r = 5X 42 / 1 N = 80 NWeight of the body = 5 X 9.8 W = 49 NWhen the body is at the highest position , Tmin = mV2 / r - mg = (80 - 49) N = 31 N