[ALI ALZAHRANI]

المشاركة الأصلية كتبت بواسطة CDTOE 2 - An automobile travels with constant acceleration is brought to stop from a speed of 20 m / s in a distance of 40 m . a - What's acceleration ? b - what's the time it takes to stop the car ?

(a)

Its acceleration can be determined using the equation

v^2 = v0^2 +2ax

a = (v^2 - v0^2) /2x = (0-20^2)/2*40 = -5 m/s^2

(b)

The time taken to bring the car to completely stop is evaluated from the equation

v = v0 +at

t = (v-v0)/a = (0-20)/-5 = 4 sec