Question

A.1.2
B.1.‾2
C.1.‾27
D.1.‾28

Answer 1

Answer:

Secondary SchoolMath 13+7 pts

A 1.2m tall girl spots a balloon moving with the wind in a horizontal line at a height of 88.2m from the ground. The angle of elevation of the balloon from the eyes of the girl at any instant is 60 degree. After some time, the angle of elevation reduces to 30 degree find the distance travelled by the balloon during the interval.

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Report by Parekhsuchita4654 03.11.2017

Answers

Shruti04

Shruti04 Ambitious

AE/CE=tan60°

AF-EF/CE=tan60°

88.2-1.2/CE= root 3

87/CE=ROOT 3

CE= 87/ROOT 3 =29 ROOT 3

IN triangle BCG,

BG/CG=tan30°

88.2-1.2/CG=1/ROOT3

87 ROOT3m-CG

distance travelled by balloon=EG=CG-CE

(87 ROOT3-29 ROOT3)m

58 Root3