Questions
An aeroplane is flying horizontally at a height of km with a velocity of 15 km/hr. The rate at which it is receding from a fixed
point on the ground which is passed over 2 minutes ago.
a
9 km/hr
b
3 km/hr
c
6 km/hr
d
10 km/hr
detailed solution
Correct option is A
l2=x2+h22ldldt=0+2xdxdtdldt=xldxdt=65×15=9km/hrx=12h=23l2=14+49=2556l=5/6Talk to our academic expert!
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