A) 10 N
B) 20 N
C) 40 N
D) 80 N
Correct Answer: B
Solution :
\[F=\frac{m{{v}^{2}}}{r}\] \[F=\frac{0.5\times 4\times 4}{0.4}\] \[F=\frac{8.0}{0.4}\] \[=\frac{80}{4}=20\,N\]
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