An aeroplane is flying in a horizontal direction with a velocity u and at a height of 2000 m . When it is vertically below a point A on the ground a food packet is released from it. The packet strikes the ground at point B . If A B = 3 km and g = 10 m s - 2 , then the value of u is

Question

An aeroplane is flying in a horizontal direction with a velocity u and at a height of 2000 m . When it is vertically below a point A on the ground a food packet is released from it. The packet strikes the ground at point B . If A B = 3 km and g = 10 m s - 2 , then the value of u is, 54 km h - 1, 540 km h - 1, 150 km h - 1, 300 km h - 1

MARKS App · Accepted Answer

Given R = 3 km = 3000 m Range, R = u 2 h g ⇒ u = R g 2 h or u = 3000 × 10 2 × 2000 = 3000 × 1 20 = 150 m s - 1 = 150 × 18 5 km h - 1 = 540 km h - 1

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