Option (iii) Object C is correct. In Fig. 6.37, the position-time curve for Object C indicates changing velocity and acceleration, which requires a non-zero net force by Newton’s laws of motion.
The position-time graph for four objects A, B, C and D moving along straight line are given in Fig. 6.37. A net force acts on: (i) Object A (ii) Object B (iii) Object C (iv) Object D
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Option (iii) is correct. In Fig. 6.37, Object B is stationary with zero velocity, while Objects A and D have straight line graphs representing uniform motion at constant velocity with zero acceleration. Object C has a curved position-time graph showing continuously increasing velocity. Since Object C possesses non-zero acceleration, a non-zero net external force acts on it according to Newton’s second law.
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