MEDIUM
9th CBSE
IMPORTANT
Earn 100

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.

Important Questions on Work and Energy

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)
MEDIUM
9th CBSE
IMPORTANT
Physics For Class 9>Chapter 4 - Work and Energy>Exercise>Q 8
If the work done by a force in moving an object through a distance of 20 cm is 24.2 J, what is the magnitude of the force?
MEDIUM
9th CBSE
IMPORTANT
Physics For Class 9>Chapter 4 - Work and Energy>Exercise>Q 9
A man of mass 55 kg climbs up the stairs of 40 steps each measuring 0.15 m. Find the work done by the man. (Take g = 10 m s-2) 
MEDIUM
9th CBSE
IMPORTANT
Physics For Class 9>Chapter 4 - Work and Energy>Exercise>Q 10
A crane pulls up a car of mass 500 kg to a vertical height of 4 m. Determine the work done by the crane. (Take g = 10 m s-2) 
MEDIUM
9th CBSE
IMPORTANT
Physics For Class 9>Chapter 4 - Work and Energy>Exercise>Q 11
How much is the mass of a man if he has to do 2500 J of work in climbing a ladder 5 m tall? (Take g =9.8 m s-2)
MEDIUM
9th CBSE
IMPORTANT
Physics For Class 9>Chapter 4 - Work and Energy>Exercise>Q 12
How fast should a man of mass 60 kg run so that his kinetic energy is 750 J?
MEDIUM
9th CBSE
IMPORTANT
Physics For Class 9>Chapter 4 - Work and Energy>Exercise>Q 13

Find the Kinetic energy of a body of mass 100 g and moving with a velocity of 25 m s-1.