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## Homework Statement

The ball launcher in a pinball machine has a spring that

has a force constant of 1.20 N/cm The surface

on which the ball moves is inclined 10.0° with respect

to the horizontal. If the spring is initially compressed

5.00 cm, find the launching speed of a 100-g ball when the

plunger is released. Friction and the mass of the plunger negligible

## Homework Equations

Ki + Ws + Wg = Kf

## The Attempt at a Solution

W = integral kx

but i don't understand where gravity comes into play. I'm trying to understand the concept, the solution manual works it out as 1.68 m/s and they use cos 100 don't understand that either