Q.

An aeroplane moving horizontally with a speed of 720 kmh-1 drops a food pocket, while flying at a height of 396.9 m. The time taken by a food pocket to reach the ground and its horizontal range is (Take 9 = 9.8 ms-2)

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a

3 s and 2000 m

b

5 s and 500 m

c

8 s and 1500 m

d

9 s and 1800 m

answer is D.

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Detailed Solution

T=2hg=2×396.99.8=9 sand u = 720km/h = 200 m/s∴    R = u x T = 200 x 9 = 1800 m
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An aeroplane moving horizontally with a speed of 720 kmh-1 drops a food pocket, while flying at a height of 396.9 m. The time taken by a food pocket to reach the ground and its horizontal range is (Take 9 = 9.8 ms-2)