A) 400m
B) 40m
C) 0.40m
D) 4m
Correct Answer: B
Solution :
Given,\[u=72km/h=20m/s\] \[a=\mu g=0.5\times 10\,\,m/{{s}^{2}}\] From \[{{v}^{2}}={{u}^{2}}-2as\] \[\therefore \] \[{{(0)}^{2}}={{(20)}^{2}}-2\times 0.5\times 10\times s\] \[\therefore \] \[s=\frac{20\times 20}{2\times 0.5\times 10}\] or \[s=40\,\,m\]You need to login to perform this action.
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