A) 0.2 s
B) 0.02 s
C) 0.5 s
D) 0.05 s
Correct Answer: A
Solution :
\[\vec{F}=\frac{\Delta \vec{p}}{\Delta t}\Rightarrow \Delta t=\frac{|\Delta \vec{p}|}{|\vec{F}|}=\frac{0.4}{2}=0.2\ s\]
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