1. The problem statement, all variables and given/known data Horse is running in circle with constant velocity V. In the middle of circle is flashlight, lighting in all directions. Wall is set as a tangent to circle. If horse starts running from tangential point and pass 1/8 of circle, what will be speed of a shadow on the wall? Can someone help me solve this? Will acceleration of shadow be constant? 2. Relevant equations V-velocity of horse R-radius of circle Vs-velocity of shadow t-time of distance traveled by horse and shadow 3. The attempt at a solution Because V is constant, time of distance traveled of horse is t=πR/4V. Distance traveled for shadow is R (radius of circle). Initial velocity of shadow is V. So if acceleration of shadow is constant: R=V*t +a*t² /2 Acceleration is equal to (Vs-V)/t My solution is Vs=V(8/π-1).