A moving boat is observed from the top of a 150m high cliff moving away from the cliff. The angle of depression of the boat changes from 60° to 45° in 2 minutes.fnd speed
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- Step-by-step explanation:
tan60=150/y
y=150/3^1/2
tan45=150/x+y
x+y=150
x=150-y = 150(3^1/2-1)/3^1/2
x is the distance travelled by the boat
therefore,
speed=D/T=x/T
=x/120 m/s
now put the value of x find the ans.
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