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    				| 1. | 12. A car of mass 800 kg moving at 54km/h is brought to rest over a distance of 15m. Find the retarding forcedeveloped by the brakes of the car. | 
| Answer» velocity is 54km/h = 54*5/18 = 15m/sand distance covered is 15m also final velocity is 0. so, u² = 2*a*s => a = u²/2s = 15*15/2*15 = 15/2 m/s² now force will me M*a = 800*15/2 = 400*15 = 6000N | |