physics
posted by Anonymous .
A driver of a car traveling at 17.4 m/s applies
the brakes, causing a uniform deceleration of
1.8 m/s2
.
How long does it take the car to accelerate
to a final speed of 13.4 m/s?
Answer in units of s.

vf=vi+a*time
you are given a as 1.8m/s^2, vf=0, vi=17.4m/s solve for time t. 
u = 17.4m/s, a = 1.8m/s^2
v = 13.4m/s
Using the first equation of motion:
=> v = u + at
=> (vu)/a = t
=> 4/1.8 = t
=> 2.22 seconds 
Arora: When you give it away free, it has no value.

Hope you've heard about equations of motion.
For this one we can use v=u+at , where v=final velocity(in m/s) , u=initial velocity(in m/s) , a=uniform acceleration(in m/S^2) and t=time(in seconds).
Now substitute values for the above equation to find the required time.
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