Question

A ball of mass m is released from rest point P on a smooth concave surface as shown in the figure. At the instant the ball crosses bottom most point B, normal reaction exerted by the surface on the ball will be:-
a- 1.2 mg
b- 1.4mg
c- 2mg
d- 3mg

Answer 1

Answer:

1.4mg

Explanation:

the potential energy loss by the particle is the kinetic energy gained by the particle .(conservation of energy).then find the centripetal force then mark all the forces at point B. the direction of the centripetal is towards centre but respective ball the force acts down ward the submission of weight of the ball and centripetal force is the normal reaction at B.