Question

if the acceleration of a moving object is constant then the motion is said
(a) motion with constant speed
(b) motion with uniform acceleration
(c) motion with uniform velocity
(d) motion with non uniform velocity ​

Answer 1

(b) motion with uniform acceleration.

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Explanation :-

Uniform acceleration :

A body has a uniform acceleration if it travels in a straight line and its velocity increases by equal amounts in equal intervals of time.

Or,

A body has a uniform acceleration if its velocity changes at a uniform rate.

Example :-

• The motion of a freely falling body is an example of uniformly accelerated motion.

• The motion of a ball rolling down an inclined plane is an example of uniformly accelerated motion.

Acceleration :

Acceleration of a body is defined as the rate of change of velocity with time.

Acceleration = Change in velocity/ Time taken

Or,

⇝ a = v - u/t

Where,

• v = Final velocity
• u = Initial velocity
• t = Time
• a = Acceleration

Answer 2

(b) as well as (d)

Reason for (b): While the acceleration of a body is constant, then the body is said to be in uniform acceleration. Or we can say it is in motion having uniform acceleration.

Reason for (d): While the acceleration is constant, that means there is a change in velocity of the object. Or we can say that the velocity will remain non uniform or the object is in motion with non uniform velocity.