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A motorcar is moving with a …

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A motorcar is moving with a velocity of 144km/hr. A small puppy comes into its way and the car takes 4 second to stop after the brakes are applied. Calculate the force exerted by the brakes on the motorcar if its mass along with the passengers is 1000kg.

Posted by Padmini Goswami 4 years ago

CBSE > Class 09 > Science

1 answers

Tanu Prajapati 4 years ago

U = 108 km/h => 108×5/18 => 6×5 => 30 m/s v = 0m/s t = 4sec therefore , a = (v-u)/t =>a = (0-30)/4 => a = -30/4 => -7.5 m/s² force = mass × acceleration force = 1000 kg × (-7.5) m/s² force = -7500 kg m/s² => force = -7500 N negative sign denotes opposing force

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CBSE > Class 09 > Science