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The work done by a friction force is:
a) Always positive
b) Always negative
c) Always zero
d) Either positive or negative depending upon the situation.
Ans: The work done by a friction force is always negative.
Echo: The sound heard after reflection from an obstacle is known as echo.
VELOCITY: The time rate of change of displacement of a body is known as velocity. It is represented by V ?.
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A bomber plane moves horizontally with a speed of 500 m/s and a bomb released from it, strikes the ground in 10 sec. angle at which it strikes the ground will be (g=10m/s) 1. tan
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