Question

what is defination of positive accelaration​

Answer 1

When an object is speeding up, the acceleration is in the same direction as the velocity. Thus, this object has a positive acceleration
EXAMPLE:
A bus or car moving with increasing speed has positive acceleration. We can say that it is accelerating with the direction of travel

Answer 2

When an object is speeding up, the acceleration is in the same direction as the velocity. Thus, this object has a positive acceleration.

Hope it helps ☺