We consider an approximation of the gravity g=10. Then the speed is given by the formula: s(t)=10t. And the coordinate is given by the formula:x(t)=5t^2+t (integrating the speed function). Now set up the equation:
Solving the above equation for t we get:t =14 seconds. <span>It will take 14 seconds for the penny to reach the ground.</span>