JEE Advanced 2023 Physics question
A person of height 1.6 m is walking away from a lamp post of height 4 m along a straight path on the flat ground. The lamp post and the person are always perpendicular to the ground. If the speed of the person is , the speed of the tip of the person's shadow on the ground with respect to the person is .
Answer: 40
Solution
Let the person be at distance and the shadow tip at from the lamp post. Similar triangles: $ = ⇒ s =
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