The bob of a simple pendulum (mass m and length l) dropped from a horizontal position strikes a block of the same mass elastically placed on a horizontal frictionless table. The K.E. of the block will be

Q. The bob of a simple pendulum (mass m and length l) dropped from a horizontal position strikes a block of the same mass elastically placed on a horizontal frictionless table. The K.E. of the block will be

Q. The bob of a simple pendulum (mass $m$ and length $l$) dropped from a horizontal position strikes a block of the same mass elastically placed on a horizontally frictionless table. The $K.E$. of the block will be:

Q. The bob of a simple pendulum (mass m and length l) dropped from a horizontal position strike a block of the same mass elastically placed on a horizontally frictionless table. The K.E. of the block will be

Q. A simple pendulum, made of a string of length $l$ and a bob of mass $m$, is released from a small angle ${\theta }_0.$ It strikes a block of mass $M$ kept on a horizontal surface at its lowest point of oscillations, elastically. It bounces back and goes up to an angle ${\theta }_1.$ The $M$ is given by :