Option (iv) is correct because according to Newton’s third law of motion, whenever two objects interact during a collision, they exert equal and opposite forces on each other regardless of differences in their masses.
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A cushioned landing mat increases the impact time during which the athlete’s downward velocity reduces to zero. According to Newton’s second law, extending the duration reduces acceleration, thereby significantly reducing the impact force and preventing injury.
Yes, the boat moves backward away from the shore. By Newton’s third law of motion, when the sailor applies a backward force on the boat to leap forward, the boat recoils in the opposite direction.
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.
Option (iv) is correct because Newton’s second law of motion establishes that when a net force acts on an object, it produces acceleration in the direction of the force directly proportional to its magnitude.