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.
When a net force acts on an object, we observe that the object accelerates: (i) opposite to the direction of force, with acceleration proportional to the force acting on the object. (ii) opposite to the direction of force, with acceleration proportional to the mass of the object. (iii) in the direction of force, with acceleration inversely proportional to the force acting on the object. (iv) in the direction of force, with acceleration proportional to the force acting on the object.
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Option (iv) is the correct statement. According to Newton’s second law of motion, the acceleration produced in a body is directly proportional to the applied net force and takes place in the direction in which that net force acts. Inversely, acceleration is inversely proportional to the mass of the object, making options (i), (ii) and (iii) incorrect.
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