Aa stone of mass 1 kg is tied with a string and it is whirled in a vertical circle of radius 1 m. If tension at the highest point is 14 N, then velocity at lowest point will be:- a) 3 m/s b) 4 m/s c) 6 m/s d) 8 m/s Share with your friends Share 78 Apurba Paul answered this The tension at the top is given byT=mvt2r-mgor, 14=1×vt21-1×10=vt2-10 (taking g=10)or, vt2=4or, vt=2Now loss of potential energy at the bottom is Kp=mgh=1×10×2=20So total kinetic energy at the bottom is 12mvb2=20+12mvt2=20+2=22so vb=44=6.6So answer c) is correct. -187 View Full Answer