Q. From the top of a tower, a particle is thrown vertically downwards with a velocity of $10ms^{- 1}$. The ratio of the distances covered by it in the 3rd and 2nd seconds of its motion is (Given, $g = 10ms^{- 2}$)

A) 7:5
B) 3:4
C) 4:3
D) 6:5
Explanation

(a) $S_{3rd} = 10 + \frac{10}{2}(2 \times 3 - 1) = 35$
$S_{2nd} = 10 + \frac{10}{2}(2 \times 2 - 1) = 25$
$\therefore\ \frac{S_{3rd}}{S_{2nd}} = \frac{35}{25}\ ie = \frac{7}{5}$

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.