Question

An iron ball and a wooden ball of the same radius are released from a height ?h? in vacuum. The time taken by both of them to reach the ground is [NCERT 1975; AFMC 1998]
A) Unequal B) Exactly equal C) Roughly equal D) Zero

Answer 1

B) exactly equal because in vaccum the speed is same of every body

Answer 2

Given that,

An iron ball and a wooden ball of the same radius are released from a height h in vacuum.

To find,

The time taken by both of them to reach the ground.

Solution,

In the vacuum, all the object fall under the action of gravity in same time. The time taken by all the object is independent of the speed and the size of the object.

It would mean that the time taken by both of them to reach the ground is exactly equal. Hence, (B) is the correct option.