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Rest and Motion: Kinematics — Physics STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 SciencePhysicsRest and Motion: Kinematics1 Mark
Question
In a projectile motion the velocity:
  1. Is always perpendicular to the acceleration.
  2. Is never perpendicular to the acceleration.
  3. Is perpendicular to the acceleration for one instant only.
  4. Is perpendicular to the acceleration for two instants.
✓

Answer

  1. Is perpendicular to the acceleration for one instant only.
Explanation:
In projectile motion, velocity is perpendicular to acceleration only at the highest point. Here, velocity is along the horizontal direction and acceleration is along the vertically downward direction.

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