A projectile is projected in the upward direction making an angle of 60° with horizontal direction with a velocity of 150 m/sec. Then the time after which its inclination with the horizontal is 45° is-
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A projectile is projected in the upward direction making an angle of 60° with horizontal direction with a velocity of 150 m/sec. Then the time after which its inclination with the horizontal is 45° is-

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G1 Physics · Accepted Answer

uₓ = 150 cos60° = 75 m/s. For inclination 45° on ascent, vᵧ = vₓ = 75 m/s. Thus 150 sin60° - gt = 75, giving t ≈ 5.49 s (with g = 10 m/s²).