Momentum and CollisionHardBloom L3
Question
Two massless strings 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 0.25 kg and 0.5 kg are attached to the string. The ball A is released from rest at a height 0.45 m 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
Options
A.5 ms–1 to the right
B.5 ms–1 to the left
C.1 ms–1 to the right
D.1 ms–1 to the left
Solution
Sol. 
Just before collision
$WET \Rightarrow v_{A} = \sqrt{2gh} = \sqrt{2 \times 10 \times 0.45}$
vA = 3 m/s = v1
∴ $v_{1}^{'} = 2.\frac{v}{3} - v = - \frac{v}{3} = - 1$m/s
Create a free account to view solution
View Solution FreeMore Momentum and Collision Questions
A flat plate moves normally with a speed v1 towards a horizontal jet of water of uniform area of cross-section. The jet ...The balls, having linear momenta and , undergo a collision in free space. There is no external force acting on the balls...Two particles of mass m, constrained to move along the circumference of a smooth circular hoop of equal mass m, are init...A particle is projected from a smooth horizontal surface with velocity v at an angle θ from horizontal. Coefficient of r...A body A of mass M while falling vertically downwards under gravity breaks into two parts; a body B of mass 1/3 M and a ...