Question

(1) Ir a leather and a stone are released from the top of
building simultaneously, the stone reaches the ground earlier
than the feather​

Answer 1

Explanation:

1. The gravitational force by earth is same everywhere.
2. The force of buoyancy is the air.
3. The force of buoyancy on the object depends on density,mass,shape and size of object.
4. The feather has less mass than stone . Therefore the stone reaches the ground earlier than stone.

Extra information:If we perform this experiment in vacuum , the both stone and feather reaches at same time .

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Answer 2

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1. The motion of a body falling in air is accelerated due to the earth's gravitational force on the body.

2. The force due to buoyancy of air acts on the body in the upward direction.

3. As the body falls, the friction with the air opposes its motion.

4. This opposition due to air depends on the size, shape, density and velocity of the body.

5. It is greater for the a feather than for a stone.

6. Hence, the stone has greater downward acceleration than the feather.

Therefore, the stone reaches the ground earlier than the feather though they are released simultaneously from the same height.

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