Answer :

Vehicle Mass = 1000 kg

Initial Velocity (that is speed) let it be u = 20 ms-1


Final Velocity let it be v= 0ms-1


Distance travelled = 50 m


Let the acceleration be "a"


From equation = v2 = u2 + 2as


Putting all value


0= 20 + 2*a*50


0= 400+ 100a


0- 400= 100a (Side changing)


-400 = 100a


-400/ 100 = a (Side changing)


-4= a


a = -4 m/s2


This shows that the acceleration is in opposite direction that means it is retardation.


Retardation = 4m/s2


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