(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A small source of light S is located at a distance L from a vertical wall. An opaque object with a height of h moves toward the wall with constant velocity v_vec of magnitude v. At time t= 0 , the object is located at the source S.

Find an expression for v_s, the magnitude of the velocity v_s_vec of the top of the object's shadow, at time t.

Express the speed of the top of the object's shadow in terms of t, v, L, and h

2. Relevant equations

it is a similar triangle problem

3. The attempt at a solution

I figured out that v*t gives me H

So i thought that since it was a similar triangle

I could use (v*t*L)/h to find the v_s

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Source of light

**Physics Forums | Science Articles, Homework Help, Discussion**