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Q.

A bomb is dropped from aeroplane moving with horizontal velocity 360 km/hr above the point A on the ground & strikes at a point ‘B’ on the ground in 20 sec. find the height of the aeroplane. (g=9.8 m/s2)

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a

960 m

b

1960 m

c

196 m

d

1200 m

answer is B.

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Detailed Solution

time of flight =t=2hg   ; given t=20 sec ; acceleration due to gravity=9.8 m/s2,  substitute in the above equation, ⇒20=2×h9.8 ⇒h=1960m=height of the aeroplane
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