a lamp is 3.3m above the ground a boy 110cm tall walks away from the base of the lamp post at a speed of 0.8m/s find the length of the shadow of the boy after 4 second
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Length of shadow of boy = 160 cm = 1.6 m
Step-by-step explanation:
Lamp height = 3.3 m = 330 cm
Boy length = 110 cm
boy speed = 0.8 m/s = 80 cm/sec
Distance covered in 4 secs = 80 * 4 = 320 cm
let say shadow length = d cm
=> 110/d = 330/(320 + d)
=> 320 + d = 3d
=> 2d = 320
=> d = 160
Length of shadow of boy = 160 cm = 1.6 m
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