Fc = mv2r
mass = 200g = 0.2kg, v = 5 m/s, r = 1.5 m
Fc = 0.2×5×51.5 ≈ 3.33N
At the bottom of the circle, the tension T in the string must counteract the weight of the stone as well as provide the centripetal force:
T = Fc + mg
T = 3.33 + 0.2 x 10 = 5.3N
