[" Such the A block of mass "m" is "],[[" 4."=(t^(3))/(3)" if "f_(1)," attached to two unstretcted "],[=(t^(3))/(3)" iffe "," springs of spring constant "],[" the force in figure.The block is ",k_(1)],[3f^(2)," displaced through a "],[3," displaced through "a],[3," distance "x" towards right "],[" have more "R," and is then released."],[" have more "R," Calculate the speed of the "],[" block as it passes through "],[" the mean position."]]