Question

Give one example where work done on an object is negative

Answer 1

If the force has a component in the direction opposite to the displacement, the force does negative work.

Answer 2

One example where work done is 0 is :

If a person is carrying a load and not moving and is moving in opposite direction
Here the person is applying force but displacment is in opposite direction I.e negative
Work done = force *displacement
= force * negative displacment
= work done = negative

Because any positive numbers multiplied by a negative number the answer would be negative

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