A body of mass 2kg collides with a wall with speed 100 m s-1 and rebounds with the same speed the force exerted on the wall is 2 x 10^4 N. The time of contactis:
Correct answer: A. 1/50 Sec
- A. 1/50 Sec
- B. 1/25 Sec
- C. 1/60 Sec
- D. 1 Sec
Explanation
F=mv/t2 x 104 N =2*(100-(-100))/tt=1/50 s
This question appeared on the ETEA MDCAT 2017 paper, which you can sit online with every answer explained.
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About Collisions
Collisions involve the conservation of linear momentum when bodies interact for a short time. The topic covers impulse, elastic and inelastic collisions, kinetic energy changes, and the coefficient of restitution, with calculations usually based on one dimensional motion. Momentum remains conserved in isolated collisions, but kinetic energy is conserved only in elastic collisions.
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