Question

a car moving at rate of 72km/h and applies brakes how much time does the car taked to stop.
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Answer 1

Explanation:

it depends upon power of break

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Answer 2

Answer:

4 seconds

Explanation:

To answer this question use the formula:

v=u+at

s={(u+v)/2}t

v2=u2+2as

s=ut+1/2at2  where s-displacement, v-final velocity, u-initial velocity, a-acceleration/retardation, t-time

• How much time does the car take to stop?

In this case V=72km/hr (convert to m/s=20m/s), u=0m/s, a=m/s2

since v=u+at...at=v-u....t=(v-u)/a

therefore t=(20-0)/5.....=20/5 =4s

therefore it takes 4 seconds to stop