Two identical blocks connected to ideal springs are oscillating on a horizontal frictionless surface. The motion of the blocks A and B over time are shown in the graph below. Displacement (cm) block A block B -.-. 3- -2- -3 Why are the periods different for blocks A and B? O Block A has a longer period because it has a smaller amplitude. O Block B has a longer period because it has a larger amplitude. O Block B has a shorter period because it has a larger spring constant. O Block A has a longer period because it has a larger spring constant