explain why two solid bodies of different masses released from rest at the same point simultaneously fall to the ground at the same time and the condition for that to happen
When two solid bodies of different masses are released from rest at the same point simultaneously, they will fall to the ground at the same time due to the principle of equivalence.
The principle of equivalence states that in a uniform gravitational field, the acceleration of an object due to gravity is independent of its mass. This means that all objects, regardless of their mass, will accelerate at the same rate towards the ground in a vacuum.
Therefore, the condition for two solid bodies of different masses to fall to the ground at the same time is that they are released from rest at the same point simultaneously in a vacuum or in a situation where air resistance can be neglected. As long as this condition is met, both bodies will experience the same acceleration due to gravity and reach the ground at the same time.