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Grade: 12
        

A car stars from rest on a half kilometer long bridge.the cofficient of friction between tyre and road os 0.1.Show that one can not drive through the bridge in less than 10s

10 years ago

Answers : (1)

Ramesh V
70 Points
							

friction force<u.N  u=coeff of frivtion

N=mg whr m is mass of car

so ma=mg  ,  a<0.1*g

s<0.5*.1*g*t2

t2>2*1*500

t > 31.6 sec

so,it cant drive bridge in 10 sec

--

regards

Ramesh

10 years ago
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