MEDIUM
9th CBSE
IMPORTANT
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A body is thrown vertically upwards. Its velocity goes on decreasing. What happens to its kinetic energy as its velocity becomes zero?

Important Questions on Work and Energy

EASY
9th CBSE
IMPORTANT
Physics For Class 9>Chapter 4 - Work and Energy>Exercise>Q 4
What is the difference between gravitational potential energy and elastic potential energy? Give one example of a body having gravitational potential energy and another having elastic potential energy.
MEDIUM
9th CBSE
IMPORTANT
Physics For Class 9>Chapter 4 - Work and Energy>Exercise>Q 1
A boy pushes a book by applying a force of 40 N. Find the work done by this force as the book is displaced through 25 cm along the path.
MEDIUM
9th CBSE
IMPORTANT
Physics For Class 9>Chapter 4 - Work and Energy>Exercise>Q 2
A person of mass 50 kg climbs a tower of height 72 meters. Calculate the work done. (Take g=9.8 m s-2)
MEDIUM
9th CBSE
IMPORTANT
Physics For Class 9>Chapter 4 - Work and Energy>Exercise>Q 3
A load of 100 Kg is pulled upwards by 5 m. Calculate the work done. (Take g=9.8 m s-2)
MEDIUM
9th CBSE
IMPORTANT
Physics For Class 9>Chapter 4 - Work and Energy>Exercise>Q 4
A ball of mass 1 kg is thrown up. It reaches a maximum height of 5 m. Calculate the work done by the force of gravity during the motion. (Take g=9.8 m s-2)
MEDIUM
9th CBSE
IMPORTANT
Physics For Class 9>Chapter 4 - Work and Energy>Exercise>Q 5
A coolie carries a load of 50 kg on his head and walks on a level road up to 100 m. Calculate the work done by him.
MEDIUM
9th CBSE
IMPORTANT
Physics For Class 9>Chapter 4 - Work and Energy>Exercise>Q 6
Calculate the work done by a student in lifting 0.5 kg book from the ground and keeping it on a shelf 1.5 m high. (take g = 10 m s-2) 
MEDIUM
9th CBSE
IMPORTANT
Physics For Class 9>Chapter 4 - Work and Energy>Exercise>Q 7
If 784 J of work was done in lifting a 20 kg mass, calculate the height through which it was lifted. (Take g = 9.8 m s-2)