Work Energy And Power

Physics
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The collision in which the relative velocity is zero after collision is

A
perfectly elastic
B
perfectly inelastic
C
partially elastic
D
sometimes elastic and sometimes inelastic
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A lighter body moving with a velocity collides with a heavier body at rest. Then :

A
the lighter body rebounces with twice the velocity of bigger body
B
the lighter body retraces its path with the same velocity in magnitude
C
the heavier body does not move practically
D
both (2) and (3)
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The K.E. of a body can be increased maximum by doubling its:

A
mass
B
weight
C
speed
D
density
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In a perfectly elastic collision :

A
both KE and momentum are conserved.
B
only KE is covered.
C
only momentum is covered.
D
neither KE nor momentum are conserved.
Easy
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In SI system, the unit of P.E. is :

A
erg
B
dyne-cm
C
joule
D
none of these
Easy
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Energy equals of a mass of one microgram in kilo joules is

A
B
C
D
Easy
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