Question

Work done by a body is
A) Negative, Positive or zero B) Always positive C) Always zero D) Always Negative

Answer 1

Answer:

Answer is a part that is work done by a body is negarive,positive or zero.

Answer 2

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!