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Retardation or deceleration is negative accelaration
formula for finding retardation is same as that of accelaration:
v-u/t, where v is the final velocity, u is the initial velocity and t is the time taken.
eg- a bus is travelling at 20 m/s. Brakes are applied to stop the bus. The total time taken by the bus to stop is 2 s. Find its retardation.
ans- v=0; u=20; t=2
accelaration= 0-20/2
a= -10 m's^2
retardation= 10 m/s^2 (because retardation is negative accelaration)
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