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Motion in a Straight Line — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysicsMotion in a Straight Line1 Mark
MCQ
The velocity of a particle is zero at t = 0.
  • A
    The acceleration at t = 0 must be zero.
  • B
    The acceleration at t = 0 may be zero.
  • C
    If the acceleration is zero from t = 0 to t = 10s, the speed is also zero in this interval.
  • D
    If the speed is zero from t = 0 to t = 10s the acceleration is also zero in this interval.
✓

Answer

  1. The acceleration at t = 0 may be zero.
  2. If the acceleration is zero from t = 0 to t = 10s, the speed is also zero in this interval.
  3. If the speed is zero from t = 0 to t = 10s the acceleration is also zero in this interval.

Explanation:

  1. Acceleration will be zero only when the change in velocity is zero.
  2. Since the acceleration is zero from t= 0s to t = 10s, change in velocity is 0.

Velocity in this interval = Initial velocity = 0

Also,

Speed in this interval = Initial speed = 0

  1. From t = 0s to t = 10s, speed is zero.

Here, velocity is zero and initial velocity is zero.

So, the change in velocity is zero; i.e., acceleration is zero.

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