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Calculate the work done by the brakes of...

Calculate the work done by the brakes of a car of mass 1000 kg when its speed is reduced from 20 m/s to10 m/s ?

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150 kJ
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LAKHMIR SINGH & MANJIT KAUR-WORK AND ENERGY-Exercise
  1. On a level road, a scooterist applies brakes to slow down from a speed...

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  2. A man drops a 10 kg rock from the top of a 5 m ladder. What is its spe...

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  3. Calculate the work done by the brakes of a car of mass 1000 kg when it...

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  4. A body of mass 100 kg is lifted up by 10 m. Find : (i) the amount of...

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  5. A boy weighing 50 kg climbs up a vertical height of 100 m. Calculate t...

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  6. What is the work done by a constant force ? When is it positive, negat...

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  7. To what height should a box of mass 150 kg be lifted, so that its pote...

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  8. A body of mass 2 kg is thrown vertically upwards with an initial veloc...

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  9. How much work is done when a force of 1 N moves a body through a dista...

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  10. A car is being driven by a force of 2.5 xx 10^(10) N. Travelling at a...

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  11. Explain by a an example that a body may possess energy when it is not ...

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  12. (a) On what factors does the gravitational potential energy of a body ...

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  13. Give two examples where a body possesses both , kinetic energy as well...

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  14. How much is the mass of a man if he has to do 2500 joules of work in c...

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  15. If the work done by a force in moving an object through a distance of ...

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  16. A boy weighing 40 kg makes a high jump of 1.5 m. (i) What is his kin...

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  17. What type of energy is possessed : (a) by the stretched rubber strin...

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  18. A weightlifter is lifting weights of mass 200 kg up to a height of 2 m...

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  19. (a) Define the term 'work'. Write the formula for the work done on a b...

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  20. (a) When do we say that work is done ? Write the formula for the work ...

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