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9th Class Science Force and laws of motion Question Bank MCQs - Force and Laws of Motion

  • question_answer
    A truck moving with a speed of 54 km/h. Truck driver applied brakes suddenly and brings the truck to rest in 5 s, then the average retarding force on truck, if mass of the truck and driver is 400 kg, will be

    A) 200 N          

    B) 600 N

    C) 800 N                                       

    D) 500 N

    Correct Answer: A

    Solution :

    [a] Given, u=54 km/h \[=54\times \frac{5}{18}\]m/s =15 m/s


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