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Statement -A: Work done by a man in lifting a bucket out of a well by means of a rope tied to the bucket is positive
Statement -B: Work done by gravitational force in lifting a bucket out of a well by means of a rope tied to the bucket is negative
Statement -C: Work done by friction on a body sliding down an inclined plane is negative
Statement-D: Work done by an applied force on a body moving on a rough horizontal plane with uniform velocity is positive
Statement- E: work done by the resistive force of air on a vibrating pendulum in bringing it to rest is negative

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C, D, E are only true

B,C, D are only true

A, B, E are only ture

A, B, C, D, E are true

answer is D.

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Detailed Solution

In statement A, angle between the force applied by the man and displacement is 0⁰. Since W = Fdcosθ, so W is positive.

In statement B θ =180⁰, so W is negative.

In statement C the angle between frictional force and displacement θ =180⁰so W is negative.

In statement D, in this case the angle (θ) between applied force and displacement is 0⁰, so W is positive.

In statement E, in this case angle between resistive force and direction of motion θ =180⁰,so W is negative.

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