Q. If a particle has a constant speed in a constant direction

A
It must have a constant deceleration
B
It must have a constant acceleration
C
It need not have a constant velocity
D
It must have a constant velocity
Solution:

To have a constant velocity, an object must have a constant speed in a constant direction. Constant direction constrains the object to motion to a straight path. Newton’s second law (F=ma ) suggests that when a force is applied to an object, the object would experience acceleration.

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