Question

A boy is running along a straight horizontal road with a constant speed \(5\,\text{m s}^{-1}\). While running he throws a stone with a velocity \(30\,\text{m s}^{-1}\) at an angle \(60^\circ\) with the horizontal. Then the time of flight of the stone is: (Given \(g = 10\,\text{m s}^{-2}\))

• A. \(3\sqrt{2}\)
• B. \(\frac{\sqrt{3}}{2}\)
• C. \(4\sqrt{3}\)
• D. \(3\sqrt{3}\)

Hint:

Time of flight depends only on vertical component of velocity, not on horizontal motion or observer’s speed.

Answer 1

The Correct Option is D