Adrag racer starts from rest and acclerates to a velocity of 30 m/s in 1 s. what is the acceleration of the racer?

Acceleration is the rate of the change in velocity per time of an object in motion. At constant velocity, acceleration is zero. It is calculated by the expression:

a = (vf - vi) / t

From the problem,

vi = 0 (at rest)
vf = 30 m/s 
t = 1 s

a = 30 - 0 / 1
a = 30 m/s^2 <ACCELERATION

The answer is b hope this