A body is thrown with the velocity 20 m s - 1 at an angle of 60 ° with the horizontal. Find the time gap between the two positions of the body where the velocity of the body makes an angle of 30 ° with horizontal.

Question

A body is thrown with the velocity 20 m s - 1 at an angle of 60 ° with the horizontal. Find the time gap between the two positions of the body where the velocity of the body makes an angle of 30 ° with horizontal., 1 . 15 s, 0 . 95 s, 1 s, 1 . 5 s

MARKS App · Accepted Answer

tan α = V y V x ⇒ 1 3 = 20 o sin 60 − 10 t 1 20. cos 60 ⇒ t 1 = 2 3 − 1 3 = 20 sin 60 − 10 t 2 20 cos 60 o t 2 = 4 3 ⇒ Δ t = 2 3 = 1.15 s

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