An aeroplane moving horizontally with a speed of 720 km/h drops a food packet,

Question

An aeroplane moving horizontally with a speed of 720 km/h drops a food packet, while flying at a height of 396.9 m. The time taken by a food packet to reach the ground and its horizontal range is

(T a k e g = 9.8 m / s e c^{2})

Options:

A . 3 sec and 2000 m

B . 5 sec and 500 m

C . 8 sec and 1500 m

D . 9 sec and 1800 m

Answer: Option D
:
D

An Aeroplane Moving Horizontally With A Speed Of 720 Km/h D...

T i m e o f d e s c e n t t = \sqrt{\frac{2 h}{g}} = \sqrt{\frac{2 \times 396.9}{9.8}} \Rightarrow t = 9 s e c a n d h o r i z o n t a l d i s t a n c e S = u \times t S = (\frac{720 \times 5}{18}) \times 9 = 1800 m

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