Question

The ball launcher in a pinball machine has a
spring that has a force constant of 1.22 N/cm.
The surface on which the ball moves is in-
clined 15.8 with respect to the horizontal.
If the spring is initially compressed 3.68 cm,
find the launching speed of a 0.172 kg ball
when the plunger is released. The acceleration
due to gravity is 9.8 m/s2 . Friction and the
mass of the plunger are negligible.
Answer in units of m/s