Question

An airplane is flying at a height of $1960m$ in the horizontal direction with a velocity of $360km/hr$. It drops a bomb. The bomb strikes a point on the ground, then the time took $t$ by the bomb to reach the ground is:

• A. $20\sqrt{2}\sec$
• B. $20\sec$
• C. $10\sqrt{2}\sec$
• D. $10\sec$

Answer 1

The correct option is B $20\sec$

As the bomb is dropped so its initial vertical velocity will be $zero.$

so time taken by bomb will be given by $h=0+\frac{1}{2}g{t}^2$

or $t=\sqrt{\frac{2h}{g}}=\sqrt{\frac{2\times 1960}{9.8}}=20second$