A) \[3N\]
B) \[3.5N\]
C) \[4.0N\]
D) \[4.5N\]
Correct Answer: D
Solution :
\[u=0,S=250m,\ t=10\sec \ \] \[S=ut+\frac{1}{2}a{{t}^{2}}\]Þ\[250=\frac{1}{2}a{{[10]}^{2}}\Rightarrow a=5m/{{s}^{2}}\] So, \[F=ma=0.9\times 5=4.5N\]
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