The ball launcher in a pinball machine has a spring with a force constant of 1.10 N/cm (Fig. P5.71). 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 0.100 kg ball when the plunger is released. Friction and the mass of the plunger are negligible.(adsbygoogle = window.adsbygoogle || []).push({});

so here's what i did

Ei = Ef, so

1/2kx^2 = mgsin@x + 1/2 mv^2

I got .377 m/s for the answer, but the real answer is 1.61 m/s

Plz tell me what i did wrong.

Thank You

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# Homework Help: Conservation of Energy pinball problem

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