Question

define acceleration find its expression and write​

Answer 1

In physics, acceleration is the rate of change of velocity of an object with respect .... As acceleration is defined as the derivative of velocity, v, with respect to time t

Answer 2

Acceleration is rate of change of velocity at any instant of time. This is particularly the definition of instantaneous acceleration.

dv/dt=a, dv/dt=lim t tends to to0 change of velocity /change of time.