## Answers

A) W= 0.8N *(0.5m-0.4m) + 0.4N *(0.75m-0.5m) + 0.2 *(x2-0.75m)

0.21J = 0.080+ 0.1 + 0.2x2

0.18 = 0.2x2

x2 = 0.90m.

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