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Solution


Q.

Identify the correct statements from the following:                                              [2023]

(A) Work done by a man in lifting a bucket out of a well by means of a rope tied to the bucket is negative.

(B) Work done by gravitational force in lifting a bucket out of a well by a rope tied to the bucket is negative.

(C) Work done by friction on a body sliding down an inclined plane is positive.

(D) Work done by an applied force on a body moving on a rough horizontal plane with uniform velocity is zero.

(E) Work done by the air resistance on an oscillating pendulum is negative.

Choose the correct answer from the options given below:
1 B and E only  
2 A and C only  
3 B, D and E only  
4 B and D only  

Ans.

(1)

B. Work done by gravitation will be negative if something is lifted upward.

E. Work done by air resistance is negative.