Find time of flight of projectile thrown horizontally with speed 10 ms⁻¹ from a long inclined plane which makes an angle of θ = 45° with the horizontal.
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Question

Find time of flight of projectile thrown horizontally with speed 10 ms⁻¹ from a long inclined plane which makes an angle of θ = 45° with the horizontal.

G1 Physics · Accepted Answer

Take the point of projection as origin. For horizontal speed 10 m/s, x = 10t and vertical drop y = 5t². The 45° incline satisfies y = x. Hence 5t² = 10t, and the nonzero root is t = 2 s. Therefore option C.