) A 1000 kg car travelling at 50 m/s slams into a 1500 kg parked truck in an inelastic manner as shown below. What is the velocity of

Question

) A 1000 kg car travelling at 50 m/s slams into a 1500 kg parked truck in an inelastic manner as
shown below. What is the velocity of the each after the collision?

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Thanh Thu 3 months 2021-07-24T14:51:35+00:00 1 Answers 1 views 0

Answers ( )

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    2021-07-24T14:52:56+00:00

    (a)

    KE = m v^2 / 2 = (1200 kg)(20 m/s)^2 / 2 = 240,000 J

    (b)

    The energy is entirely dissipated by the force of friction in the brake system.

    (c)

    W = delta KE = KEf – KEi = (0 – 240,000) J = -240,000 J

    (d)

    Fd = delta KE

    F = (delta KE) / d = (-240,000 J) / (50 m) = -4800 N

    The magnitude of the friction force is 4800 N.

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