A) \[6\,kN\]
B) \[30\,kN\]
C) \[60\,kN\]
D) \[30000\,kN\]
Correct Answer: B
Solution :
Given, \[v=60\,km/h\] \[=60\times \frac{5}{18}=\frac{50}{3}m/s\] \[v=u+ft\] \[\Rightarrow \] \[\frac{50}{3}=0+f\times 20\] \[\Rightarrow \] \[f=\frac{50}{3\times 20}=\frac{5}{6}m/{{s}^{2}}\] Required force, \[P=mf\] \[=36000\times \frac{5}{6}\] \[=30000\,N\] \[=30\,\,kN\]You need to login to perform this action.
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