Kinetic and Static Friction

AP Physics 1· difficulty 1/5

0.04~\text{m}

A
$500~\text{N/m}$
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B
$5~\text{N/m}$
C
$80~\text{N/m}$
D
$0.8~\text{N/m}$

Explanation

F = k x \Rightarrow k = F/x = 20/0.04 = 500~\text{N/m}

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