2. Two cars A and B are heading forward. The velocity of A and B are 30 m/s and 20 m/s respectively. If their masses are same as 9.0*1

Question

2. Two cars A and B are heading forward. The velocity of A and B are 30 m/s and 20 m/s
respectively. If their masses are same as 9.0*10^5 g, (a) find out their initial momentum, (b) if
they have an accident and then the velocity of the B is 28 m/s, find out velocity of A. (c) Final
momentum of each car. Il

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Eirian 6 months 2021-07-16T11:40:09+00:00 1 Answers 3 views 0

Answers ( )

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    2021-07-16T11:41:12+00:00

    Answer:

    A.) 27000 kgm/s

    18000 kgm/s

    B.) Va = 22 m/s

    C.) 19800 kgm/s

    25200 kgm/s

    Explanation: Given that the velocity of A and B are 30 m/s and 20 m/s. And of the same mass M = 9 × 10^5g

    M = 9×10^5/1000 = 900 kg

    A.) Initial momentum of A

    Mu = 900 × 30 = 27000 kgm/s

    Initial momentum of B

    Mu = 900 × 20 = 18000 kgm/s

    B.) if they have an accident and then the velocity of the B is 28 m/s, find out velocity of A.

    Momentum before impact = momentum after impact

    Given that Vb = 28 m/s

    27000 + 18000 = 900Va + 900 × 28

    45000 = 900Va + 25200

    900Va = 45000 – 25200

    900Va = 19800

    Va = 19800/900

    Va = 22 m/s

    C.) Momentum of A after impact

    MV = 900 × 22 = 19800 kgm/s

    Momentum of B after impact

    MV = 900 × 28 = 25200 kgm/s

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