Question

A light house of 150m in the mid seaand angle of elevation of ships changes from 60° to 45° in 2 min what is speed of ship

Answer 1

h = 150 m

tan 60° =√3

tan 45° = 1

POINT ON BC IS 'D'

SPEED = DISTANCE / TIME

DISTANCE = DC

DC = BC - BD

tan 60 = AB/BD = 150/BD =√3

BD = 50√3

tan 45 = AB/BC = 150/BC = 1

BC = 150

DC = 150 - 50√3 = 50√3(√3-1)

SPEED = DISTANCE/120                                         || 2min =120 sec

50√3(√3-1)/120

= 0.528 m/sec

HOPE THIS HELPS PLS MARK IT AS BRAINLIEST!!!