Question

A boy at top of a vertical obs
ervation tower observes a car moving at uniform speed coming directly towards the tower. If it takes 10 minutes for angle of depression to change from 30degree to 60 degree, how much after this will the car reach the observation tower
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Answer 1

Answer:

A man standing at the top of the tower observes a car at an angle of depression of 30o, which is approaching the foot of the tower with a uniform speed. Six seconds later, the angle of depression of the car is found to be 60o.

Answer 2

Answer:

Equating i terms to get S

S = (-sina -(2n+3)Sin(na) + (2n+1)Sin(n+1)a ) / - 4Sin²(a/2)

=> S = (Sina + (2n+3)Sin(na) - (2n+1)Sin(n+1)a) / 4Sin²(a/2)