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Consider a car moving on a straight road...

Consider a car moving on a straight road with a speed of `100m//s`. The distance at which car can be stopped is `[mu_k=0.5]`

A

100m

B

400m

C

800m

D

1000m

Text Solution

Verified by Experts

The correct Answer is:
D
The frictional force `F=mu_kR=mu_k`mg retards the motion of the car.
The retardation a=`(mu_kmg)/(m)=m_kg`
`:'" "v^2=u^2-2as` but v=0
`:." "u^2=2as`
`s=(u^2)/(2a)=(u^2)/(2xxmu_kg)=(100xx100)/(2xx0.5xx10)=1000m`
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