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CBSE Notes 2011-2012 » IX-Science-Term2

# Work and Energy

## A boy holds a mass on his stretched hand. Then

Multiple choice question

A boy holds a mass on his stretched hand. Then

## A man holds and displaces a 20 kg mass horizontally in his stretched hand.

Multiple choice question

A man holds and displaces a 20 kg mass horizontally in his stretched hand.

## Two masses m and 2m are dropped from certain height 'h'. Then on reaching the ground,

Multiple choice question

Two masses m and 2m are dropped from certain
height 'h'. Then on reaching the ground,

## Two cars A and B approaching each other with momentum of 50 kg m/s and 25 kg m/s respectively, stick...

Multiple choice question

Two cars A and B approaching each other with
momentum of 50 kg m/s and 25 kg m/s respectively,
stick to each other after collision. The momentum
after the collision is

## Two cars A of 25 kg and B of 50 kg moving with a speed of 25 m/s and 10 m/s in the same direction un...

Multiple choice question

Two cars A of 25 kg and B of 50 kg moving with a
speed of 25 m/s and 10 m/s in the same direction
undergo collision. If A gets a velocity of 5 ms_1 in
the same direction after the collision, the K.E. of
the car B is,

## In a collision,

Multiple choice question

In a collision,