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UPSC Civil Service Exam Questions

Q1: A vehcile was stopped in two seconds by fully jamming the brakes. The skid marks measured 9.8 metre's. The average skid resistance coefficient will be

A 0.7

B 0.5

C 0.4

D 0.25

ANS:B - 0.5

t=2 sec
S=9.8 m
F=?
Now w*f=(w*a)/g
Hence, f=a/g.

From v=u+at
If v=0,then u=-at,
Now, v^2 - u^2=2aS
Puting above values
a=2S/ t^2.

Now with the help of given data
a=4.9, hence f=4.9/9.81= 0.499= 0.5Answer.



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