# the 4-kg slider is released from rest in position A and slides down the vertical-plane guide . if the maximum compression of the spri?

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- FiremanLv 71 month ago
By the law of energy conservation:

=>PE(A) = PE(spring) + Uf

=>mgh = 1/2kx^2 + Uf

=>Uf = mgh - 1/2kx^2

=>Uf = 4 x 9.8 x 0.6 - 1/2 x 20 x 10^3 x (40 x 10^-3)^2

=>Uf = 7.52 J

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- Andrew SmithLv 71 month ago
E in spring = 1/2 k x^2 = 10 * 0.04^2

E from potential = m gh = 4 * 9.8 * 0.6

As energy is conserved U1 + 1/2 k x^2 = mgh substitute to find the work lost.

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