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# 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

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

$velocity= 7 \sin 4t;$
displacement = $\large\frac{7}{4}$$(1-\cos 4t);$
acceleration $=28 \cos w$
Hence b is the correct answer.