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Question

An airplane flying at a height of 1960 m from the ground with constant horizontal velocity of 600 km/h releases a bomb to hit a target on the ground. The time of flight and range of the bomb respectively are

A
15 s and 2.50 km
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B
20 s and 3.33 km
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C
25 s and 6.00 km
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D
20 s and 5.00 km
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Solution

The correct option is B 20 s and 3.33 km

u=600 km/hH=1960 m
tf= time of flight and
R= range of projectile

Using, H=uytf+12gt2f
H=0.tf+12gt2f
tf=2Hg
tf=2×19609.8=400=20 s

Here, R=ux×tf=600×203600 km
R=10/3 kmR=3.33 km

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