Which of the following quantities specifies its speed with direction?

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RRC Group D Previous Paper 44 (Held On: 4 Dec 2018 Shift 2)
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  1. Displacement
  2. Momentum
  3. Velocity
  4. Force

Answer (Detailed Solution Below)

Option 3 : Velocity
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Detailed Solution

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The correct answer is Velocity

Key Points

  • A vector quantity is specified by its magnitude as well as the direction associated with it.
    • For example: - Acceleration, velocity, displacement, and angular velocity.
  • Velocity is defined as a vector measurement of the rate and direction of motion of an object.
    • velocity formula when an object moving in a straight line: r = d / t
      • r is the rate or speed, d is the distance moved, t is the time it takes to complete the movement.
    • SI unit: meter/second.
    • Other units: mph, ft/s, Km/h.

Additional Information

Displacement
  • Displacement is a vector quantity that refers to "how far out of place an object is".
  • It is the object's overall change in position.
Momentum
  • Momentum is a vector quantity that is a product of the mass (weight) of a particle and its velocity (speed).
  • SI unit: kilogram meter per second (kg⋅m/s).
  • Newton's 2nd law of motion related to the momentum that is the rate of change of momentum in an object is directly proportional to the force applied.
Force
  • Force is defined as a push or pulls exerted on one object by another.
  • Force measured in Newtons (denoted N, where 1 N is the force required to give a 1 kg mass an acceleration of 1 m/s²).
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