A ball is projected upwards from the top of the tower with a velocity 50 m s - 1 making an angle 30 ° with the horizontal. The height of tower is 70 m . After how many seconds the ball will strike the ground?

Question

A ball is projected upwards from the top of the tower with a velocity 50 m s - 1 making an angle 30 ° with the horizontal. The height of tower is 70 m . After how many seconds the ball will strike the ground?, 3 s, 5 s, 7 s, 9 s

MARKS App · Accepted Answer

Y ¯ = v ¯ y t + 1 2 a ¯ y t 2 70 = - 50 sin ⁡ 3 0 ° t + 1 2 × 10 × t 2 70 = - 25 t + 5 t 2 or t 2 - 5 t - 14 = 0 t = 7 s ( - v e time is not possible)

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