A sedan car of mass 200kg is moving with a certain velocity . It is brought to rest by the application of brakes, within a distance of 20m when the average resistance being offered to it is 500N.What was the velocity of the motor car?
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Given,
Mass of motor car, m=200 kgFinal velocity, v=0Distance travelled, s=20 mAcceleration, a=F/m=-500 / 200=-2.5 m/s2Using,v2-u2=2as0-u2=2×(-2.5)×20=-100or initial velocity, u=10 m/s
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