EASY
10th ICSE
IMPORTANT
Earn 100

A body of mass 10 kg is moving with a velocity 20 m s-1. If the mass of the body is doubled and its velocity is halved, find the ratio of the final kinetic energy to the initial kinetic energy.

Important Questions on Work, Energy and Power

EASY
10th ICSE
IMPORTANT
Selina Icse Concise Physics For Class 10>Chapter 2 - Work, Energy and Power>EXERCISE-2(B)>Q 19
A truck weighing 1000 kgf changes its speed from 36 km h-1 to 72 km h-1 in two minutes. Calculate: (i) the work done by the engine and (ii) its power. Take g=10 m s-2.
EASY
10th ICSE
IMPORTANT
Selina Icse Concise Physics For Class 10>Chapter 2 - Work, Energy and Power>EXERCISE-2(B)>Q 20
A body of mass 60 kg has the momentum 3000 kg m s-1. Calculate: (i) the kinetic energy and (ii) the speed of the body.
EASY
10th ICSE
IMPORTANT
Selina Icse Concise Physics For Class 10>Chapter 2 - Work, Energy and Power>EXERCISE -2(B)>Q 21
How much work is needed to be done on a ball of mass 50 g to give it s momentum of 500 g cm s-1?
EASY
10th ICSE
IMPORTANT
Selina Icse Concise Physics For Class 10>Chapter 2 - Work, Energy and Power>EXERCISE -2(B)>Q 22
How much energy is gained by a box of mass 20 kg when a man carrying the box waits for five minutes for a bus?
EASY
10th ICSE
IMPORTANT
Selina Icse Concise Physics For Class 10>Chapter 2 - Work, Energy and Power>EXERCISE -2(B)>Q 22
How much energy is gained by a box of mass 20 kg when a man runs carrying the box with a speed of 3 m s-1 to catch the bus ?
EASY
10th ICSE
IMPORTANT
Selina Icse Concise Physics For Class 10>Chapter 2 - Work, Energy and Power>EXERCISE-2(B)>Q 22
How much energy is gained by a box of mass 20 kg when a man raises the box by 0·5 m in order to place it inside the bus ? (g=10 m s-2)
EASY
10th ICSE
IMPORTANT
Selina Icse Concise Physics For Class 10>Chapter 2 - Work, Energy and Power>EXERCISE-2(B)>Q 23
A spring is kept compressed by a small trolley of mass 0.5 kg lying on a smooth horizontal surface as shown in the figure. When the trolley is released, it is found to move at a speed v = 2 m s-1. What potential energy did the spring possess when compressed?
Question Image
EASY
10th ICSE
IMPORTANT
Selina Icse Concise Physics For Class 10>Chapter 2 - Work, Energy and Power>EXERCISE-2(C)>Q 1
Mention two characteristics which a source of energy must have.