#### Consider a car moving on a straight road with a speed of 100 m/s he distance at which car can be stopped is Option 1) Option 2) Option 3) Option 4)

As we learnt in

Kinetic or Dynamic Friction -

kinetic friction

coefficient of kinetic friction

R = reaction

- wherein

depends on the nature of surface in contact.

$Retardation\: due\: to\: friction= \mu g$

$\because \nu ^{2}= u^{2}+2as$

$\therefore 0=\left ( 100 \right )^{2}-2\left ( \mu g \right )s$

$or\: \: \: 2\mu gs= 100\times 100$

$or\: \: \: s= \frac{100\times 100}{2\times 0.5\times 10}= 1000\: m$

Correct option is 4.

Option 1)

This is an incorrect option.

Option 2)

This is an incorrect option.

Option 3)

This is an incorrect option.

Option 4)

This is the correct option.