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3 December, 13:35

A 0.200 kg air-track glider moving at 1.20 m/s bumps into a 0.600 kg glider at rest.

a.) Find the total kinetic energy after collision if the collision is elastic.

b.) Find the total kinetic energy after collision if the collision is completely inelastic.

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  1. 3 December, 13:49
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    a) 0.144J

    b) 0.12J

    Explanation:

    A 0.200 kg air-track glider moving at 1.20 m/s bumps into a 0.600 kg glider at rest. a.) Find the total kinetic energy after collision if the collision is elastic. b.) Find the total kinetic energy after collision if the collision is completely inelastic.

    Given that

    M1 = 0.2kg

    M2 = 0.6kg

    U1 = 1.2 m/s

    Since both momentum and energy are conserved in elastic collisions, the total kinetic energy after collision will be

    1/2M1U^2 + 1/2M2U^2

    1/2 * 0.2 * 1.2^2 + 0

    K. E = 0.144J

    B) In elastic collision, only momentum is conserved

    M1U1 + M2U2 = (M1 + M2) V

    U2 = 0 since the object is at rest

    0.2*1.2 + 0 = (0.2 + 0.6) V

    0.24 = 0.8V

    V = 0.24/0.8

    V = 0.3 m/s

    K. E = 1/2 (M1+M2) V

    K. E = 1/2 (0.2 + 0.6) * 0.3

    K. E = 0.4 * 0.3

    K. E = 0.12J
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