Question

A particle is projected with velocity 100 mis at 30?. Time of flight is

• A. 5 s
• B. 10 s
• C. 15 s
• D. 7.5 s

Answer 1

Answer: (B)

10 s

Answer 2

As, $T = \frac{2u \sin \theta}{g}$
Here, $u = 100 \, m \, s^{-1} , \theta = 30^\circ , g = 10 \, m\, s^{-2}$
$\therefore \:\:\: T = \frac{2 \times 100 \times \sin 30^\circ }{10} = 10 s$