Question

Two stones A and B are thrown with velocity 10 $m{s}^{-1}$ and $20m{s}^{-1}$ from the top of a tower horizontally if they reach the ground after times $t_1$ and $t_2$ respectively, then be

• A. $t_1^2=2t_2^2$
• B. $t_1=t_2$
• C. $t_1=2t_1$
• D. $t_1=2t_2$

Answer 1

The correct option is B $t_1=t_2$

time of flight for a projectile is given by :- $t=\sqrt{\frac{2h}{g}}$

cuarly,t does not depend on initial horizontal velocity

as h=same for A & B (height of tower)

so,we get $t_1=t_2$