If the velocity of a spring mass system which starts from zero is given by $6 \sin(4t)$ then its amplitude of displacement and accelerations are

Question

$\begin{array}{1 1}(a)\;5\;\&\;3 \\(b)\;1.5\;\&\;24 \\( c)\; 15\;\&\;1.67 \\(d)\;15\;\&\;3 \end{array}$