Question

If we drop three watermelons weighing $2\text{kg}$, $4\text{kg}$ and $6\text{kg}$ respectively from the same height and at the same time, which one of it will reach the ground first? (Given: negligible air resistance)

(A) Watermelon weighing $2\text{kg}$
(B) Watermelon weighing $4\text{kg}$
(C) Watermelon weighing $6\text{kg}$
(D) All three will reach at the same instant. [1 Mark]

Answer 1

If $G$ is universal gravitational constant and $M_e$ is the mass of earth and $R_e$ is the radius of earth then acceleration due to gravity $g$ would be:
$g=\frac{G{M}_e}{R_e^2}$
So, the acceleration due to gravity is independent of the mass of the body. Hence, all the bodies will hit the ground at the same time.

Hence option D is correct. [1 Mark]