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In preparation for shooting a ball in a pinball machine, a spring(k = 675 N/m) is...

In preparation for shooting a ball in a pinball machine, a spring(k = 675 N/m) is compressed 0.0650 m from its relaxed length. Theball (m = 0.0585 kg) is at rest against the spring at Point A. Whenthe spring is released, the ball slides (without rolling andwithout colliding with other objects) to Point B, which is 0.300 mhigher than Point A. How fast is the ball moving at B? (Neglect allfriction forces.)
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Answer #1
Strategy: Apply conservation ofmomentum.


But it is stationary at Point A.
PE(s) = PE + KE
.5kx2 = mgh + .5mv2
.5(675)(.0652) = .0585(9.8)(.3) +.5(.0585)v2
V= 6.55 m/s
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