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9th Class Science Work and energy Question Bank 9th CBSE Science Work and energy

  • question_answer
      On a level road, a scooterist applies brakes to slow down from a speed of 54 km/h to 3 6 km/h. What amount of work is done by the brakes? [Assuming the mass of the empty scooter is 86 kg and that of the scooterist and petrol is 64 kg]  

    Answer:

       Total mass = 86 +64 = 150 kg Initial velocity, u =54 km/h Final velocity v = 36 km / h Work done by brakes =KE lost by the scooter = Final KE-Initial KE


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