The ball launcher in a pinball machine has a spring that has a force constant of

$1\mathrm{.}20\frac{N}{c}m.$ The surface on which the ball moves is inclined $10$ with respect to the

horizontal. If the spring is initially compressed $5cm,$ find the launching speed of a

$100g$ ball when the plunger is released. Friction and the mass of the plunger are

negligible. $($Sin ${10}^0=0\mathrm{.}17$;Cos$10=0\mathrm{.}98)$

A$)1\mathrm{.}68\frac{m}{s}$

B$)3\mathrm{.}88\frac{m}{s}$

C$)4\mathrm{.}48\frac{m}{s}$

D$)20\mathrm{.}97\frac{m}{s}$

E$)12\mathrm{.}22\frac{m}{s}$