A driver takes 0.20 s to apply the brakes after he sees a need for it. This is called the reaction time of the driver. If he ils driving a car at a speed of 54 km/h and the brakes cause a deceleration of `6.0 m/s^2`, find the distance travelled by the car after he sees the need to put the brakes on.

Options

A. `25m`
B. `375m`
C. `360m`
D. `40m`

Answer

B

Explanation

A driver ………..
The vehicle suffers displacement only till it stops and not of afterwards as brakes provide acceleration till `v != 0`
`:.` for displacement
`Delta x, v_(x)^(2) = u_(x)^(2)+2a_(x)Delta x`
`v_(x)= 0 implies Delta x = ((15)^(2))/(2xx0.3)= 375 m`