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If they are released at the same time at the same height they will hit the ground at the same time.
how is the diameter related to the time it takes the ball to fall
The brick and the tennis ball might land at the same time, but the leaf will fall last.
It won't affect the rate of fall, which is 9.8m/s2. If you drop a bowling ball and a crumpled ball of paper from the same height, they will land at the same time. The earth's gravity determines the rate of fall. During the Apollo 15 moon landing, a feather and a hammer were dropped from the same height and they landed at the same time. The moon's gravity determined their rate of fall. Refer to the related link to see the demonstration.
All object fall at the same rate in a vacuum. If you drop a feather and a bowling ball at the same time in a vacuum, they would hit the ground at the same time.
Whichever you drop first will fall first and hit the ground first.If you drop them at exactly the same time from the sameplace, they fall together and hit the ground together.
If they are released at the same time at the same height they will hit the ground at the same time.
Neither ... they would fall together.
They would fall in same time in a vacuum, but if air is present the ball falls faster due to high air resistance on the leaf
They will fall at the same time, and also hit the ground at approximately the same time (given errors for air resistance).
Discounting any friction with the air, they would both hit the ground at the same time.
how is the diameter related to the time it takes the ball to fall
The brick and the tennis ball might land at the same time, but the leaf will fall last.
If they're both dropped from the same place, on the same planet, then they'll both experience the same acceleration, and hit the ground with the same speed at the same time.
Both will fall at the same time in vacuum because there is no resistance.
Both will reach the ground at the same time if they were dropped at the same time in a vacuum. This is a well proven fact that the mass has no effect on the acceleration of an object in a free fall in a vacuum.
Considering gravity puts the same amount of force on each, they would technically fall at the same time.