Total Energy (a) Conserved 12. Which one of the following is true in the case of inelastic collisions? Kinetic Energy Conserved Momentum Conserved (b) Conserved Not Conserved Conserved (c) Conserved Not Conserved (d) Not Conserved Conserved Not Conserved Conserved 13. In system of particles, internal forces can change: (a) The linear momentum but not the kinetic energy (b) The kinetic energy but not the linear momentum (c) Linear momentum as well as kinetic energy (d) Neither the linear momentum nor the kinetic energy 14. From a point on smooth floor of a room, a ball is shot to hit a wall. The ball then returns back to the point of projection. If the time taken by the ball in returning is twice the time taken in reaching the wall, find the coefficient of restitution. (a) e = 1/1 2 1 (b) e === 3 (c) e = 4 1 (d) e=0.2 15. A particle of mass mi makes on elastic, one dimensional collision with a stationary particle of mass m2. What fraction of the kinetic energy of mi is carried away by my? m m2 m2 m (c) 2mm2 (m+m) (d) 4mm (m +m)