A piece of marble is projected from the earth's surface with a velocity of 50 m s - 1 . 2 s later, it just clears a wall 5 m high. What is the angle of projection?

Question

A piece of marble is projected from the earth's surface with a velocity of 50 m s - 1 . 2 s later, it just clears a wall 5 m high. What is the angle of projection?, 45 °, 30 °, 60 °, sin - 1 1 4

MARKS App · Accepted Answer

Using the equation of motion in y-dir s = u t + 1 2 a t 2 Height after 2 s , h = 5 = 50 sin θ t - 1 2 g t 2 5 = 50 sin θ 2 - 1 2 · 10 · 2 2 25 100 = sin θ sin θ = 1 4 θ = sin - 1 1 4

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