# Numerical Problems Based on Class 9 Science Chapter 11 Work and Energy

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Q.1. A man weighing 70 kg carries a weight of 10 kg on the top of a tower 100 m high. Calculate the work done by the man (g = 10m/s2).

Q.2. A porter lifts a luggage of 15 kg from the ground and puts it on his head 1.5 m above the ground. Calculate the work done by him on the luggage.

Q.3. A ball of mass 1 kg thrown upwards, reaches a maximum height of 4 m. Calculate the work done by the force of gravity during the vertical displacement. (g = 10m/s2)

Q.4. An engine pulls a train 1 km over a level track. Calculate the work done by the train given that the frictional resistance is 5 x 105 N.

Q.5. A boy of mass 55 kg runs up a flight of 40 stairs, each measuring 0.15m. Calculate the work done by the boy.

Q.6. A force of 10 N acts on an object. The object is displaced through 12 m, in the direction of the force. If the force acts all through the displacement, find the work done by the force.

Q.7. A porter lifts a luggage of 15 kg from the ground and puts it on his head 1.5 m above the ground. Calculate the work done by him on the luggage.

Q.8. A crane pulls up a car of mass 500 kg to a vertical height of 4 m. Calculate the work done by the crane.

Q.9. Find the amount of work done by a labourers who carrier ‘n’ bricks of ‘m’ kg each to the roof of a house ‘h’ metre high by climbing a ladder.

Q.10. A force of 5 N acts on an object. The object id displaced through 8 m, in the direction of the force. If the force acts all through the displacement, find the work done by the force.

Q.11. A collie carries a load of 50 kg on his head and walks on a level road upto 100 m. What is the work done by him?

Q.12. A boy pushes a book by applying a force of 40 N. Find the work done by this force on the book is displaced through 25 cm along the path.

Q.13. Calculate the work done in lifting 200 kg of water through a vertical height of 6 metres (g= 10m/s2).

Q.14. A car weighing 1000 kg and traveling at 30m/s stops at a distance of 50m decelerating uniformly. What is the force exerted on it by the brakes? What is the work done by the brakes?

Q.15. Calculate the work done by a student in lifting 0.5 kg book from the ground and keeping it on a shelf 1.5m high.

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