If the velocity of a spring mass system which starts from zero is given by $7 \sin(4t)$ then its amplitude of displacement and accelerations are

Question

$\begin{array}{1 1}(a)\;5\; \&\; 3 \\(b)\;1.75\; \& \;28 \\( c)\; 15\; \&\; 1.67 \\(d)\;15 \;\& \;3 \end{array}$