Question

What is the formula for acceleration and decceleration?

Answer 1

a = Δv / Δt 
deceleration=(final time-initial time)/time taken 

Answer 2

we know F = Ma;

rearranging, we get a=F/M;

or

acceleration=change in velocity/change in time;

decceleration=(square of final velocity - square of initial velocity)/2times of time taken;