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1 December, 11:53

A car (mass 1 kg) on a frictionless track collides with a stationary car (mass 0.5 kg). The velocity of the first car before the collision is 2 m/s. The velocity of the 1st car after the collision is 1 m/s. (a) What is the velocity of the second car? (b) Was the collision elastic? i. Yes ii. No

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  1. 1 December, 14:56
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    (a) 2 m/s

    (b) Not elastic

    Explanation:

    m1 = 1 kg, m2 = 0.5 kg

    u1 = 2 m/s, u2 = 0

    v1 = 1 m/s, v2 = ?

    (a) Let the velocity of second car after collision is v2.

    By the use of conservation of momentum,

    m1 u1 + m2 u2 = m1 v1 + m2 v2

    1 x 2 + 0 = 1 x 1 + 0.5 x v2

    2 = 1 + 0.5 v2

    v2 = 2 m/s

    Thus, the velocity of second car after collision is 2 m/s.

    (b) The collision is said to be elastic if the kinetic energy is also conserved.

    Kinetic energy before collision = 1/2 m1 u1^2 + 1/2 m2 u2^2

    = 0.5 x 1 x 4 + 0 = 2 J

    Kinetic energy after collision = 1/2 m1 v1^2 + 1/2 m2 v2^2

    = 0.5 x 1 x 1 + 0.5 x 0.5 x 4 = 1.5 J

    Here, kinetic energy is conserved, so the collision is not elastic.
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