Home
Class 11
PHYSICS
Two identical balls, each of mass m, are...

Two identical balls, each of mass `m`, are tied with a string and kept on a frictionless surface. Initially, the string is slack. They are given velocities `2u` and `u`. in the same direction. Collision between the balls is perfectly elastic.

What is the final loss in kinetic energy of the balls?

A

`m u^(2)//4`

B

`m u^(2)//2`

C

`3m u^(2)//4`

D

`m u^(2)`

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Similar Questions

Explore conceptually related problems

Two identical balls, each of mass m , are tied with a string and kept on a frictionless surface. Initially, the string is slack. They are given velocities 2u and u . in the same direction. Collision between the balls is perfectly elastic. After the first collision, what is the total loss in kinetic energy of the balls?

Two identical balls, each of mass m , are tied with a string and kept on a frictionless surface. Initially, the string is slack. They are given velocities 2u and u . in the same direction. Collision between the balls is perfectly elastic. What is the impulse generated in the string during the first collision?

Three blocks of masses m , m and M are kept on a frictionless floor as shown in the figure .The leftmost block is given velocity v towards the right . All the collision between the blocks are perfectly inelastic . The loss in kinetic energy after all the collision is 5//6th of initial kinetic energy. The ratio of M//m will be

Two identical balls each of mass m interconnected by a small light inextensible string are kept on a smooth horizontal surface. One of the balls is pushed towards the other with a speed v_(0) find the loss of K.E. of the ball. What will be the final velocities of the balls ? (e=1).

Two balls of masses m each are moving at right angle to each other with velocities 6 m/s and 8 m/s respectively. If collision between them is perfectly inelastic, the velocity of combined mass is

Two balls having masses m and 2m are fastened to two light strings of same length shown in the figure. The other ends of the strings are fixed at O. The strings are kept in the same horizontal line and the system is released from rest. The collision between the balls is elastic. (a). Find velocities of the balls just after their collision. (b). How high will the balls rise after the collision.

Two massless string of length 5 m hang from the ceiling very near to each other as shown in the figure. Two balls A and B of masses 0.25kg and 0.5kg are attached to the string. The ball A is released from rest at a height 0.45m as shown in the figure. The collision between two balls is completely elastic. Immediately after the collision, the kinetic energy of ball B is 1 J The velocity of ball A just after the collision is

Two indentical balls A and B moving with velocities u_(A) and u_(B) In the same direction collide. Coefficient of restitution is e. (a) Deduce expression for velocities of the balls after the collision. (b) If collision is perfectly elastic, what do you observe?

Two balls having masses m and 2m are fasrtened to two light strings of same length (figure). The other ends of the strings are fixed at O. The strings are kept in the same horizontal line and the system is released from rest. The collision between the balls is elastic. Point A is the lowest point at which either ball can reach The position at which the balls will collide for the first time

Three balls A, B and C of same mass m are placed on a frictionless horizontal plane in a straight line as shown. Ball A is moved with velocity u towards the middle ball B . If all the collisions are elastic, find the final velocities of all the balls.