Question

Displacement-time graph of a particle moving in a straight line is as shown in figure. Select the correct alternative

• A. Work done by the all the forces in region OA and BC is positive
• B. Work done by the forces in region AB is zero
• C. Work done by all the forces in region BC is negative
• D. Work done by all the forces in region OA is negative

Answer 1

Answer: (B), (C)

The correct options are
B Work done by the forces in region AB is zero
C Work done by all the forces in region BC is negative

Region OA has positive work because slope of graph is inceasing (meaning velocity increase or acceleration)

Region AB has zero work because constant slope (meaning constant velocity or no acceleration)

Region BC has negative work because slope constantly decreases (meaning negative acceleration)