Two blocks connected to identical 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- 4 Time (s) -2- -3- Why are the periods different for blocks A and B? O Block B has a shorter period because its smaller amplitude means the spring constant is bigger. O Block B has a longer period because it has more mass. O Block A has a longer period because it has more mass. O Block A has a longer period because it has a larger amplitude