Question

win a car moving with a initial velocity of 10 M per second applies breaker and bring the car at rest in 5 seconds then what is acceleration

Answer 1

(v- u) /t = a
(0 -10) /5 =a
a = -2 m/ s2

Answer 2

acceleration (a)= dv/dt
dv = v-u
v =final velocity
u= initial velocity
v=0
u=10
dt=5
a= -10/5
a= -2m/sec^2 which is negative acceleration called retardation