Question

Two balls A and B of same size are dropped from the same point under gravity. The mass of A is greater than that of B. If the air resistance acting on each ball is same, then:

• A. Both the balls reach the ground simultaneously
• B. The ball A reaches earlier
• C. The ball B reaches earlier
• D. Nothing can be said

Answer 1

The correct option is B The ball A reaches earlier

For a body dropped from certain height, time taken by it to reach the ground is given by
$t=\sqrt{\frac{2H}{a}}$
$\Rightarrow t\alpha \frac{1}{\sqrt{a}}$
As $a_A>a_B$
Ball A takes less time to reach the ground than ball B.