Work done by a body is
A) Negative, Positive or zero B) Always positive C) Always zero D) Always Negative
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Answer is a part that is work done by a body is negarive,positive or zero.
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Answer:
Negative, Positive or Zero (a)
Explanation:
Consider the motion of a block moving in the direction of force.
W = F · S · cos(0) = F · S , which is positive
Now, if we consider the motion of a ball moving upwards, against the force of gravity, then
W = F · S · cos(180) = - F · S, which is negative
If the object remains at rest, like when we push a block against the floor itself, then S = 0, so W = 0
Hope it helps!
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