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Question

The quantity that best represents the motion of a rigid body is
  1. its mass.
  2. its velocity.
  3. its speed.
  4. its linear momentum.

A
its mass.
B
its velocity.
C
its speed.
D
its linear momentum.
Solution
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Mass of a body is the quantity of inertia possessed by it, or in simpler words, it is the measure of resistance that a body can provide to change in its motion.
Speed is the measure of how fast a body is moving.
Velocity is the measure of how fast a body is moving along with its direction.
Linear momentum is the quantity which denoted the motion of body along with its direction.

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