9th Class Science Force and laws of motion Question Bank Force and Laws of Motion

  • question_answer
    A large truck and a car, both moving with a velocity of magnitude v, have a head-on collision and both of them come to halt after that. If the collision lasts for 10 s then
    (i) The car will experience the greater force of impact exerted by the truck
    (ii) The truck will experience the greater momentum change
    (iii) Car will experience the greater average acceleration than truck.

    A) Only (i) and (ii) are correct.

    B)        Only (ii) and (iii) are correct.

    C)        Only (iii) and (i) are correct.

    D)        All (i), (ii) and (iii) are correct.

    Correct Answer: A

    Solution :

    (i) Due to the greater momentum possessed by the truck.
    (ii) Due to heavier mass of the truck its initial momentum was greater, which becomes zero after collision.
    (iii) Change in velocities of both the vehicles is equal in equal interval of time.


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