A) \[10\,m/{{s}^{2}}\]
B) \[25\,m/{{s}^{2}}\]
C) \[2.5m/{{s}^{2}}\]
D) \[5m/{{s}^{2}}\]
Correct Answer: C
Solution :
Tension the string \[=m\,(g+a)=\]Breaking force Þ \[20(g+a)=25\times g\] Þ \[a=g/4=2.5\ m/{{s}^{2}}\]
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