Two balls of masses  and  are moving towards each other with speeds  and , respectively. They collide head-on and their speeds are  and  after collision Column-I Column- II (A) The speed  (in m/s) so that both balls move in same direction if co-efficient of restitution is (p) (B) The speed (in m/s) so that the maximum fraction of energy is transformed to (assume elastic collision) (q) (C) Co-efficient of restitution if  stops after collision and  m/s (r) 2 (D) If collision is inelastic and  the loss of kinetic energy (in  after collision may be (s) 4 CODES :   A B C D     a) c c,d a,b,c,d a     b) c,d c a a,b,c,d     c) a c,d c a,b,c,d     d) c,d a,b,c,d c a

Question ID - 101106 :- Two balls of masses  and  are moving towards each other with speeds  and , respectively. They collide head-on and their speeds are  and  after collision Column-I Column- II (A) The speed  (in m/s) so that both balls move in same direction if co-efficient of restitution is (p) (B) The speed (in m/s) so that the maximum fraction of energy is transformed to (assume elastic collision) (q) (C) Co-efficient of restitution if  stops after collision and  m/s (r) 2 (D) If collision is inelastic and  the loss of kinetic energy (in  after collision may be (s) 4 CODES :   A B C D     a) c c,d a,b,c,d a     b) c,d c a a,b,c,d     c) a c,d c a,b,c,d     d) c,d a,b,c,d c a

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Answer Key : (b) -
 (b) i. Solving, we get is always positive For ii. For maximum energy to transfer to Solving, we get iii. For this iv. Depends upon

Next Question :
 Match the following: Column-I Column- II (A) Inelastic collisions (p) Kinetic energy of the system may decrease (B) Elastic collisions (q) Kinetic energy of the system may increase (C) Total work done is zero (r) Kinetic energy of the system may remains constant (D) Non-conservative forces are not present (s) Just before and after collision, momentum remains constant CODES : A B C D a) c a,d b,d a,d b) c,d c a,d a,b,c c) c a,d c,d a,b,c d) a,d c,d c a,b,c

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