A girl of height 95 cm moves away from the base of a lamps post at a speed of 1.2cm/s. if the lamp is 2m 85cm above the ground ,find the lenth of her shadow after 3 seconds
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Answer:
1.8 cm M.
Step-by-step explanation:
let shadow DE = x & lamp at
height AB = 2m85cm = 285cm
& height of girl = CD = 95 cm
AB will be parallel to CD .
distance travelled in 3 sec
BD = 1.2 × 3 (speed×time) = 3.6 cm
BE = 3.6 + x
AB/CD = BE/DE=> 285/95 = (3.6 + x)/x
3x =3.6 + x =>x = 1.8 cm
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I have attached the hand written solution you may go through it
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