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3.2 , motion in plane — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysics3.2 , motion in plane1 Mark
MCQ
Check up the only correct statement in the following :-
  • A
    A body has a constant velocity and still it can have a varying speed.
  • ✓
    A body has a constant speed but it can have a varying velocity.
  • C
    A body having constant speed cannot have any acceleration.
  • D
    A body in motion under a force acting upon it must always have work done upon it.
✓

Answer

Correct option: B.
A body has a constant speed but it can have a varying velocity.
b
When a body possesses constant velocity, both its magnitude (i.e., seed) and direction must remain constant. On the other hand, if the speed of a body is constant, then its velocity may or may not remain constant. For example, in uniform circular motion, through the speed of a body remains constant, velocity changes from point to point due to a change in direction. A body moving with a constant speed along a circular path constantly experiences a centripetal acceleration.

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