Question

A hollow iron ball and a solid iron ball are dropped from the same height. Neglecting air resistance, which ball reaches the ground first?

• A. Solid iron ball
• B. Hollow iron ball
• C. Both will reach at the same time
• D. They wont reach the ground

Answer 1

Answer: (C)

Both will reach at the same time

Considering the air resistance as nil, the weight in both the cases will be $mg$. So, the acceleration would be $g$ by newton's second law of motion.

Now , $s=ut+\frac{1}{2}g{t}^2$

s: displacement is same for both the balls

$u=0$ for both and $g=9.8m/s^2$

So both of them will take the same time to reach the ground .