# Which of the following freely falling object will have maximum acceleration in a vacuum? 1. Iron rod 2. Cotton piece 3. Plastic piece

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Which of the following freely falling object will have maximum acceleration in a vacuum?

1. Iron rod

2. Cotton piece

3. Plastic piece

1. Iron rod
2. Cotton piece
3. Plastic piece
4. All of the above will have same acceleration.

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Correct Answer - Option 4 : All of the above will have same acceleration.

CONCEPT:

• Gravitational acceleration: An acceleration that an object receives due to the force of gravity acting on it.
• Gravitational Acceleration: It is calculated by using the formula

$g = {GM\over R^2}$

where g is the gravitational acceleration, G is the gravitational constant, M is the mass of the earth and R is the radius of the earth.

EXPLANATION:

• When an object freely falls in a vacuum at the earth's surface, it falls with gravitational acceleration g.

The gravitational acceleration $g = {GM\over R^2}$ of any object depends on the mass of the earth M, the radius of the earth R.

• It does not depend on the mass of the object or the size of the object.
• So all objects will have the same acceleration.
• Hence the correct answer is option 4.