A) 5 seconds
B) 10 seconds
C) 12 seconds
D) 6 seconds
Correct Answer: D
Solution :
\[v=u-at\Rightarrow \ t=\frac{u}{a}\] [As \[v=0\]] \[t=\frac{u\times m}{F}\]\[=\frac{30\times 1000}{5000}=6\ \sec \]
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