Question

# Brakes are applied suddenly to a racing car travelling at $$50\ m/s$$. If the car stops after $$20$$ seconds, calculate the retardation of the car.

Solution

## Initial velocity of the car $$(u)=50\ m/s$$Final velocity of the car $$(v)=0$$ (The car stops)Time $$=20\ s$$Acceleration $$=\dfrac{v-u}{t}=\dfrac{0-50}{20}=-2.5\ m/s^{2}$$When it is written as retardation, no negative sign is required.$$\therefore$$ Retardation of the car $$=2.5\ m/s^{2}$$Physics

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