Question

If we go inside a mine and drop a $104\,lb$ iron ball and $1\,lb$ aluminium ball from the top of a high platform, neglecting air resistance.
A. Both will reach the floor at the same time
B. $1\,lb$ weight will reach the floor first
C. $10\,lb$ weight will reach the floor first
D. It is not possible to indicate which of the two will reach the floor first without further data

Answer 1

Hint:Here we have to apply the concept of acceleration due to gravity and air resistance. Air resistance is a force caused by air. Resistance behaves in the opposite direction to an object travelling through the air. Air resistance, also known as drag, is a force created by air, which moves in the opposite direction of an object passing through the air. It's where the air particles reach the front of the object, slowing it down.

Complete answer:
Acceleration due to gravity is the acceleration of the mass due to gravitational force. Its unit for SI is $m{s^{ - 2}}$. It has both magnitude and direction, since it's a vector quantity. Acceleration is expressed by $g$ due to gravity. The normal value of g at sea level on the surface of the planet is $9.8\,m{s^{ - 2}}$.

If there is no air resistance, the rate of fall depends only on how much the mass has slipped, no matter how large the mass is. This means that two objects would hit the earth at the same time as they fall together from the same height. The feather and the ball do not land at the same pace in the air.

If we go inside a mine and drop a $104\,lb$ iron ball and $1\,lb$ aluminium ball from the top of a high platform both will reach the floor at the same time. It's because the gravitational acceleration is constant on all objects independent of the mass, neglecting the resistance of the air. The acceleration is constant on all objects.

Hence, option A is correct.

Note:Here we have to see if there is air resistance in the body or not. If there is air resistance then the bodies of different masses will fall at different times. Also remember that the more surface ground it is, the more air particles it impacts and the resistance is also greater.