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Solve the following questions. (i) A v...

Solve the following questions.
(i) A vertical tower stands on a horizontal plane and is surmounted by a flagstaff of height 7 m. From a point on the ground, the angle of elevation of the bottom of the flagstaff is `30^(@)` and that of the top of the flagstaff is `45^(@)`. Find the height of the tower. (Use `sqrt(3) = 1.732`)
(ii) The angle of elevation of an aeroplane from a point on the ground is `45^(@)`. After 15 seconds flight, the elevation changes to `30^(@)`. If the aeroplane is flying at a height of 3000 m, then find the speed of the plane. (Use `sqrt(3) =1.732`)

A

(i) 8.62 m (ii) 101.6 m/sec

B

(i) 9.56 m (ii) 146.4 m/sec

C

(i) 9.24 m (ii) 138.4 m/sec

D

(i) 9.56 m (ii) 125.8 m/sec

Text Solution

Verified by Experts

The correct Answer is:
B
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