The apparent weight of a man in a moving lift is less than his real weight when it is going down with A. Uniform speed B. An acceleration C. Linear momentum D. Retardation

The correct answer is B. An acceleration.

When a lift is going down with an acceleration, the apparent weight of a man in the lift is less than his real weight. This is because the force of gravity is acting downwards, but the force of the lift’s acceleration is acting upwards. These two forces are in opposite directions, so they cancel each other out to some extent. This means that the man feels lighter than he would if he were standing on the ground.

The other options are incorrect because they do not explain why the apparent weight of a man in a moving lift is less than his real weight when it is going down with an acceleration.

• Option A is incorrect because uniform speed does not create an acceleration.
• Option C is incorrect because linear momentum is a property of an object, not a force.
• Option D is incorrect because retardation is the opposite of acceleration.