A body falls freely from rest. It covers as much distance in the last second of its motion as covered in the first three seconds. The body has fallen for a time of:

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answer is B.

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Detailed Solution

Concept: The concept of a free-falling body is crucial. Students can learn more about free fall bodies by linking them to laws such as Newton's law of motion. The terms "weightlessness" and "free fall" should not be used interchangeably by students.
As we can see, the body is just being affected by the gravitational force; not even air resistance has an impact on it. Therefore, it qualifies as a free fall body.
Displacement in the nth second of the free fall is:

Given that

Displacement in 3 seconds of the free fall

Given that:

On solving that we get:

Hence, the correct option is 2.

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