Question

Acceleration is the change in velocity per unit​

Answer 1

The rate of change in the velocity of an object per unit time is referred as acceleration and the kind of motion is known as accelerated motion. The acceleration is positive when it is in the direction of velocity and negative when it is opposite to the direction of velocity.

Answer 2

Acceleration is the change in velocity per unit​ time

• The rate of change of velocity with time is called acceleration.

               Acceleration (a) = $\frac{Change in Velocity }{Time}$

• When the velocity of a particle increases with time, the particle is said to be accelerating.
• Example - A train starts from a station and speeds up. In this case, we can say that the train is moving with an acceleration.