The figure shows the velocity and acceleration of a point like body at the initial moment of its motion. The acceleration vector of the body remains constant. The minimum radius of curvature of trajectory of the body is

Radius of curvature is minimum when aN = 2 m/s2 So, velocity component along acceleration should be zero.At certain instant velocity anti-parallel to acceleration will be zero then velocity = 8 cos 60o = 4 m/sa=v2rr=4×42=8 m