A $0\mathrm{.}45$ kg block oscillates back and forth along a straight line on a frictionless horizontal surface. Its displacement from the origin is given by x $=(14$ cm$)$cos$[(12$ rad$/$s$)$t $+$ $/2$ rad$]($a$)$ What is the oscillation frequency?$($b$)$ What is the maximum speed acquired by the block?$($c$)$ At what value of x does this occur?$($d$)$ What is the magnitude of the maximum acceleration of the block?$($e$)$ At what positive value of x does this occur?$($f$)$ What force, applied to the block by the spring, results in the given oscillation?