Question

State TRUE or FALSE for given STATEMENTS , Give REASON for FALSE statement :
(i) Total mechanical energy is always conserved in collision .
(ii) Kinetic energy is always conserved in collisions .
(iii) Velocity before and after collision of respective bodies remain same .
(iv) Total momentum is always conserved in collisions .

Answer 1

(i) Total mechanical energy is always conserved in collision .
Yes. This is TRUE Total mechanical energy is conserved.

(ii) Kinetic energy is always conserved in collisions .
No. This is FALSE. In Inelastic collision, Kinetic energy is not conserved. But in elastic collision is conserved.

(iii) Velocity before and after collision of respective bodies remain same .
This is FALSE. Velocities are changes after collision. Before and after collisions velocities of given bodies are changes.

(iv) Total momentum is always conserved in collisions .
Yes, This is TRUE... In any collision (inelastic or elastic) total momentum is conserved.