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The SI unit of momentum is _____.
1. kg ms-2
2. kg ms1
3. kg ms2
4. kg ms-1

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Correct Answer - Option 4 : kg ms-1

The correct answer is kg ms-1.

  • The SI unit for momentum is kg m/s-1.
    • Newton's second law of motion in terms of momentum states that the net external force equals the change in momentum of a system divided by the time over which it changes.
  • Momentum can be defined as "mass in motion."
    • All objects have mass; so if an object is moving, then it has momentum - it has its mass in motion.
    • The amount of momentum that an object has is dependent upon two variables: how much stuff is moving and how fast the stuff is moving
    • . Momentum depends upon the variables mass and velocity.
    • In terms of an equation, the momentum of an object is equal to the mass of the object times the velocity of the object.
    • Momentum = mass * velocity
  • Hence, the correct option is 4.

  • Impulse
    • These concepts are merely an outgrowth of Newton's second law as discussed in an earlier unit.
    • Newton's second law (Fnet = m * a) stated that the acceleration of an object is directly proportional to the net force acting upon the object and inversely proportional to the mass of the object.
    • Impulse = Change in momentum

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