# Match the entries in Column I with those in Column II Column-I Column- II (A) An impulsive force acts at a height  on a solid sphere, lying on a rough surface (p) Momentum is conserved (B) A small particle of mass  moving horizontally collides with a vertical hinged rod inelastically (q) Angular momentum is conserved (C) A small particle of massstrikes elastically at the end of a horizontal rod kept on a smooth surface (r) Energy is conserved (D) A small particle of mass collides with a vertical rod elastically (s) Momentum increases CODES :   A B C D     a) D b,d a,b,c b,c,d     b) d c b a     c) b,a c,d c a     d) b,a b,c d a,c

## Question ID - 101094 | SaraNextGen Top Answer Match the entries in Column I with those in Column II Column-I Column- II (A) An impulsive force acts at a height  on a solid sphere, lying on a rough surface (p) Momentum is conserved (B) A small particle of mass  moving horizontally collides with a vertical hinged rod inelastically (q) Angular momentum is conserved (C) A small particle of massstrikes elastically at the end of a horizontal rod kept on a smooth surface (r) Energy is conserved (D) A small particle of mass collides with a vertical rod elastically (s) Momentum increases CODES :   A B C D     a) D b,d a,b,c b,c,d     b) d c b a     c) b,a c,d c a     d) b,a b,c d a,c

Answer Key / Explanation : (a) -

(a)

a. Immediately the sphere will gain velocity, so momentum increases

b. Here angular momentum about the hinged point will remain constant

Applying conservation of angular momentum about

Final momentum,

This is greater than

c. Here no external force or external torque acts. So all remain conserved, as the collision is elastic

d. Here also momentum increases. As the collision is elastic, so energy is also conserved. Angular momentum is conserved about the hinged point