A girl of height 120 cm is walking away from the base of a lamp-post at a speed of 1.2 m/s. If the lamp is 4.8 m above the ground, then find the length of her shadow after 6 s. (hoping to find the answer soon I'm desperate)
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Subject:
CBSE BOARD X -
Author:
cujo -
Created:
1 year ago
Answers 2
Answer: 2.4 m
Explanation:
Distance of girl from lamp after 6 seconds = 1.2×6 = 7.2 m
120 cm = 1.2 m
Let the length of shadow be x
[tex]\frac{4.8}{7.2+x}=\frac{1.2}{x}[/tex]
[tex]\Rightarrow 4.8x=8.64+1.2x[/tex]
[tex]\Rightarrow 4.8x-1.2x=3.6x=8.64[/tex]
[tex]\Rightarrow x=\frac{8.64}{3.6}=2.4[/tex]
The length of shadow is 2.4 m
Hope it helped
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Author:
headlightsccgh
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Rate an answer:
4
Answer:
2.4m
Explanation:
Distance of girl from lamp after 6 seconds = 1.2×6 = 7.2 m
120 cm = 1.2 m
Let the length of shadow be x
\frac{4.8}{7.2+x}=\frac{1.2}{x}
7.2+x
4.8
=
x
1.2
\Rightarrow 4.8x=8.64+1.2x⇒4.8x=8.64+1.2x
\Rightarrow 4.8x-1.2x=3.6x=8.64⇒4.8x−1.2x=3.6x=8.64
\Rightarrow x=\frac{8.64}{3.6}=2.4⇒x=
3.6
8.64
=2.4
The length of shadow is 2.4 m
Hope it helped
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Author:
michellefodk
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Rate an answer:
10
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