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  5. Work and energy

9th Class Science Work and energy Question Bank Work Power and Energy IIT JEE Objective Problems

  • question_answer
    A motor boat is having a steady speed of 20 m/s. If the water resistance to the motor boat is 600 N, then the power is

    A)  12 kW                  

    B)  120 kW

    C)  9.8 kW                                

    D)  1200 kW

    Correct Answer: A

    Solution :

      Given, speed of motor boat \[(v)=20\,\,m/s\] Force\[(F)=600\,\,N\] Power (P) = ? We know that,\[P=F\times v\Rightarrow P=600\times 20=1200W\,\,or\,\,12\,\,kW\]     


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