A) \[\sqrt{5}\,s\]
B) \[\sqrt{7}\,s\]
C) \[2\sqrt{10}\,s\]
D) \[\sqrt{10}\,s\]
Correct Answer: D
Solution :
Given, mass m = 15 kg acceleration, \[a=1\,m/{{s}^{2}}\] and initial velocity, \[u=0\] As the length of rope is 5 m. So, height attained by child in given as \[s=ut+\frac{1}{2}a{{t}^{2}}\] \[\Rightarrow \] \[5=0+\frac{1}{2}\times 1\times {{t}^{2}}\Rightarrow {{t}^{2}}=5\times 2\] or, \[t=\sqrt{10}\,s\]You need to login to perform this action.
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