PhysicsA car weighing 10 g is initially moving with a velocity of 50 m/s. On applying a constant force on the ball for, 2 s, it acquires a velocity of 70 m/s. The initial momentum of the car will be

A car weighing 10 g is initially moving with a velocity of 50 m/s. On applying a constant force on the ball for, 2 s, it acquires a velocity of 70 m/s. The initial momentum of the car will be


  1. A
    2 kg m/s
  2. B
    10 kg m/s
  3. C
    0 
  4. D
    0.5 kg m/s 

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    Solution:

    A car weighing 10 g is initially moving with a velocity of 50 m/s. On applying a constant force on the ball for, 2 s, it acquires a velocity of 70 m/s. The initial momentum of the body will be 0.5 kg m/s.
    Given that,
    Mass (m) = 10 g
    Initial velocity (u) = 50 m/as its car started.
    Final velocity (v) = 70 m/s
    Time (t) = 2 s
    From the relation of momentum, mass and velocity
    Momentum = mass ×velocity
    Initial momentum= 10 ×501000 = 0.5 kg m/
     
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