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請問這題一定只能用積分做嗎？能用w=fs的公式做嗎？
一力F=k|c|,作用在物體使其由x=-2移動到x = 2則此力作功
單選:
a. 4 k
b.8kx
c. 0
d. 2 k
你答錯了!
W = √ Fdx = [k|x|dx
若
# x=0-2 • µ! W= [ * kxdx = = kx² * = —-k(2)′ - -0-2k
一起
若x=-2~0,則 W=[-kxdx=-
因此W=2k+2k 4k
正確答案:4k
=0+ ½ k(−2)² = 2k
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