# A sphere ball of mass moving with initial velocity collides elastically with another ball of mass which is fixed at one end of shaped rigid massless frame as shown in Fig (a). The shaped frame contains another mass connected at the other end The speed of the striking mass after collision is a) backwards b) 0 c) in same direction d) backwards

## Question ID - 101406 :- A sphere ball of mass moving with initial velocity collides elastically with another ball of mass which is fixed at one end of shaped rigid massless frame as shown in Fig (a). The shaped frame contains another mass connected at the other end The speed of the striking mass after collision is a) backwards b) 0 c) in same direction d) backwards

3537

(d)

Applying conservation of momentum  (i)  (ii) Applying conservation of angular momentum about ,  (iii)

Solving Eqs. (i), (ii) and (iii), we get Angle rotated,  Next Question :

Two discs and are mounted coaxially on a vertical axle. The discs have moments of inertia and respectively about the common axis. Disc is imparted an initial angular velocity using the entire potential energy of a spring compressed by a distance . Disc is imparted an angular velocity by a spring having the same spring constant and compressed by a distance . Both the discs rotate in the clockwise direction

 The loss of kinetic energy during the above process is a) b) c) d)  