Conservation of Energy Question

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SUMMARY

The discussion revolves around a conservation of energy problem in structural mechanics, specifically using the equation 1/2 * Load * Displacement = Sum of (P^2 * L/2AE). The user provided specific values: A = 1x10^3 m^2, FAB = 90kN, FBC = 120kN, Length of AB = 1.5 m, and Length of BC = 2 m. The user's calculated displacement was 1.33 mm, while the correct answer is 2.08 mm, indicating an error in their calculations or assumptions. The discrepancy suggests a need for a review of the application of the formula and the values used in the calculations.

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Having problems with part (c) here, question is attached below in full.

Homework Statement


Force%20in%20beams%20problem.png


Using the equation 1/2 * Load * Displacement = Sum of (P^2 * L/2AE)

From the past questions I have the following info, these are also included in the solutions so are accurate:

A = 1x10^3 m^2
FAB = 90kN
FBC = 120kN
Length of AB = 1.5 m
Length of BC = 2 m

Homework Equations



The Attempt at a Solution


My attempt at the solution:

1/2 * 150 x 10^3 * Displacement = 1/(2 * 1x10^-3 * 205x10^9) * ((90x10^3^2 * 1.5)+ (120x10^3^2 * 2))

Displacement = ((90x10^3^2 * 1.5)+ (120x10^3^2 * 2)) / 1x10^-3 * 205x10^9 * 150x10^3

= 1.33 mm

The correct answer, per the solutions, is 2.08 mm.

Any idea where I've gone wrong?

Thanks.
 
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