EASY
9th CBSE
IMPORTANT
Earn 100

Calculate the change that should be affected in the velocity of a body to maintain the same kinetic energy, if the mass of the body is increased to four times.

Important Questions on Work, Energy & Power
EASY
9th CBSE
IMPORTANT
A certain force acts on a body of mass and changes its velocity from to . Calculate the work done by the force.

EASY
9th CBSE
IMPORTANT
Calculate the energy possessed by a stone of mass kept at a height of . (Given )

EASY
9th CBSE
IMPORTANT
An engine supplies of energy. If the energy is supplied to the weight of , how high can it be lifted? (Given )

EASY
9th CBSE
IMPORTANT
If of energy were used to raise a boy above the ground, how high would he be raised? (Given, )

EASY
9th CBSE
IMPORTANT
A bag of rice weighs . Calculate the height to which it should be raised so that its potential energy is . (Given, )

EASY
9th CBSE
IMPORTANT
An electric bulb consumes of energy in one minute. Calculate its power.

EASY
9th CBSE
IMPORTANT
If the heart works in one minute. What is its power?

MEDIUM
9th CBSE
IMPORTANT
Water is falling on the blades of a turbine at a rate of . The height of the fall is . Calculate the power given to the turbine. (Given, )
