Question

A body of mass 10 kg, projected at an angle of 30° from the ground with an initial velocity of 5 m/s, acceleration due to gravity is g = 10 m/s^2, what is the time of flight?

(a) 0.866s

(b) 1.86 s

(c) 1.96 s

(d) 1.862 s

The question was posed to me during an internship interview.

Origin of the question is Simple Projectile Motion topic in chapter Motion in a Plane of Physics – Class 11

Answer 1

The correct choice is (a) 0.866s

To explain I would say: The formula for time of flight is t = 2(v sinθ/g). Here, v = 5, θ = 30°, g = 10. Hence, on solving we will get the time of flight as 0.866 s.