Q. Two bodies being a free fall from rest, from the same height 2s apart. How long after the first body begins to fall the two bodies will be 40m apart? (Take $g = 10ms^{- 2}$)

A) 1 s
B) 2 s
C) 3 s
D) 4 s
Explanation

(c) $\frac{1}{2}gt^{2} - \frac{1}{2}g(t - 2)^{2} = 40$
or $\frac{1}{2} \times 10(2t - 2)(2) = 40$ or $2t - 2 = 4$ or $t = 3$s

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

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