There Is a Red Dot on the Outer Edge of a Wheel

Short Answer

There is a red dot on the outer edge of a wheel. The wheel is rolling on the ground in a counterclockwise direction and has diameter 15 inches. Find a formula using the sine function for the height of the dot above ground level after t seconds if the wheel completes one full revolution every 2 seconds. At t= 0 the dot in 9 o'clock position