Question

Two objects of different masses falling freely near the surface of the moon would

• A. Have same velocities at any instant
• B. Have different acceleration
• C. Experience forces of the same magnitude
• D. Undergo a change in their inertia

Answer 1

The correct option is A

Have same velocities at any instant

Explanation for correct options:

1. Instantaneous velocity does not depend upon the mass or the shape of the object.
2. It depends upon the initial velocity and the acceleration of the object.
3. Since, both the objects are falling freely, the initial velocity will be zero for both of them.
4. Again, the acceleration is also the same for any object falling freely.
5. Hence, the velocity of any object at any instant will be always the same.

Therefore, option (A) is correct.

Explanation for incorrect options:

Free fall and motion

1. When an object freely falls from a certain distance, its acceleration solely depends upon the acceleration due to gravity.
2. As the acceleration due to gravity is constant at any instant, the acceleration of the object will not change, and it will be the same for all the objects.

Hence, option (B) is incorrect.

3. The force experienced by any object depends upon its mass.

So, for different objects, the force experienced may be different.

Hence option (C) is incorrect.

4. Inertia of any object depends upon its mass and shape.

The mass and the shape of any object remains always the same, hence, the inertia of the object will always be the same.

Hence, option (D) is incorrect.

Hence, option (A) is the correct answer.