Exams › NEET › Physics

A steel ball of radius 2 cm is at rest on a frictionless surface. Another ball of radius 4 cm moving at a velocity of 81 cm / sec collides elastically with first ball. After collision the smaller ball moves with speed of

1. 81 cm / sec
2. 63 cm / sec
3. 144 cm / sec
4. None of these

Correct answer: 144 cm / sec

Related NEET Physics questions

• A body of mass m is moving in a circle of radius r with a constant speed v . The force on the body is r mv 2 and is directed towards the centre. What is the work done by this force in moving the body over half the circumference of the circle
• A force acts on a 30 gm particle in such a way that the position of the particle as a function of time is given by 3 2 4 3 t t t x    , where x is in metres and t is in seconds. The work done during the first 4 seconds is
• A force k j c i F ˆ 2 ˆ ˆ 3 ) (     acting on a particle causes a displacement: k j i s ˆ 3 ˆ 2 ˆ 4 ) (      in its own direction. If the work done is , 6 J then the value of ' ' c is
• A particle is acted upon by a force of constant magnitude which is always perpendicular to the velocity of the particle, the motion of the particle takes place in a plane. It follows that
• A particle moves under the effect of a force F = Cx from x = 0 to 1 x x  . The work done in the process is
• The potential energy of a certain spring when stretched through a distance ‘ S ’ is 10 joule . The amount of work (in joule) that must be done on this spring to stretch it through an additional distance ‘ S ’ will be

⚔️ Practice NEET Physics free + battle 1v1 →