A 4 kg cannonball is shot from the ground into the air with an initial upward velocity of 100 m/s. Assume the ball experiences air resistance proportional to its velocity, given by a drag coefficient of b = 0.5 N/(m/s). At what time does it strike the ground? i.e., find x(t) = height of the ball at time t, and solve the equation x(t) = 0 for t. You may need a graphing calculator to determine the intersection point