Question

what is formula of accelaration.And accelaration of an object 142m/s

Answer 1

Acceleration is defined as the rate of change of velocity
  = change of velocity / time duration , in which the velocity changed

Direction of acceleration is the direction change in velocity

we need more info for acceleration along with speed/velocity

Answer 2

acceleration=velocity÷timetaken
so,velocity=142 m/s
     time taken =not given so ,0
so, 142÷0=0
so acceleration=0