Question

Two balls are dropped from the same height at 1-second interval of time. The separation between the two balls after 3 seconds of the drop of the first ball is:

• A. 50m
• B. 40m
• C. 35m
• D. 25m

Answer 1

The correct option is D

25m

Position of the first ball after 3 seconds,

$S_1=\frac{g{t}^2}{2}=\frac{10\times 9}{2}=45m$

Position of the second ball after 2 seconds,

$S_2=\frac{10\times 2^2}{2}=20m$

Separation = $S_1-S_2$ = 25m