Asmall diameter lead ball and a large diameter rubber ball are dropped from a tower. the balls hit the ground at the same time. what conclusion can be drawn about the force of gravity?
a) no conclusion can be drawn without more information about the two balls.
b) the rubber ball must have a greater gravitational force because it is larger.
c) the lead ball must have a greater gravitational force because it is more
dense.
d) they must have the same gravitational force because they hit the ground at
the same time.

Explanation:

Galileo Galie was the first physicist to experiment with gravity. He introduced the concept of acceleration when he was studying objects free falling and the variation of the speed of a ball depending on the slope of the inclined plane.

One important conclusion that Galileo made was that all objects fall at the same rate, and without wind friction, all objects will fall at the same time no matter their weight or form.

So, in this case, both balls are gonna reach the ground at the same time, beacuse both of them have the same acceleration, which is gravity.

Therefore, the right answer is D) They must have the same gravitational force because they hit the ground at  the same time.