EASY
9th CBSE
IMPORTANT
Earn 100

A body of mass 100 kg is lifted up by 10 m. Find: (i) the amount of work done, (ii) potential energy of the body at that height. (g= 10 m s-2)

Important Questions on Work and Energy

MEDIUM
9th CBSE
IMPORTANT
Essentials of PHYSICS Class IX>Chapter 4 - Work and Energy>Practice Problems>Q 6
A stone of mass 10 g is placed on the top of a tower 50 m high. What is its potential energy? If the stone is allowed to fall freely under the action of gravity, what will be its kinetic energy just before touching the ground? Given g = 9.8 m s-2.
EASY
9th CBSE
IMPORTANT
Essentials of PHYSICS Class IX>Chapter 4 - Work and Energy>Practice Problems>Q 7
A ball of mass 200 g falls through a height of 2 m. What is its kinetic energy, when it reaches the ground?
MEDIUM
9th CBSE
IMPORTANT
Essentials of PHYSICS Class IX>Chapter 4 - Work and Energy>Practice Problems>Q 8
A ball of mass 0.5 kg slows down from a speed of 5 m s-1 to that of 3 m s-1. Calculate the change of kinetic energy of ball. State your answer giving proper units.
EASY
9th CBSE
IMPORTANT
Essentials of PHYSICS Class IX>Chapter 4 - Work and Energy>Practice Problems>Q 9
A bag of wheat weighs 75 kg. Calculate the height to which it should be raised so that its potential energy is 7500 J. (g = 10 m s-2).
EASY
9th CBSE
IMPORTANT
Essentials of PHYSICS Class IX>Chapter 4 - Work and Energy>Practice Problems>Q 10
A moving body of mass 30 kg has 60 J of kinetic energy. Calculate its speed.
EASY
9th CBSE
IMPORTANT
Essentials of PHYSICS Class IX>Chapter 4 - Work and Energy>Practice Problems>Q 11
A moving body of mass 20 kg has 40 J of kinetic energy. Calculate its speed.
EASY
9th CBSE
IMPORTANT
Essentials of PHYSICS Class IX>Chapter 4 - Work and Energy>Assignment>Q 1
Define the term energy?
EASY
9th CBSE
IMPORTANT
Essentials of PHYSICS Class IX>Chapter 4 - Work and Energy>Assignment>Q 2

Identify the energy possessed by: A Rolling Stone.