a car accelerates at a rate of 2 m/s^2. How long does it take for this car to go from rest to a speed 36 km/h? what is the distance covered by the car during acceleration?
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Explanation:
The acceleration unit, whilst looking a little confusing, means that the car will increase in velocity by 2.6m/s every second hence the
/
s
2
.
This means the velocity (speed) is going 2.6, 5.2, 7.8m/s every second. To go from 24.6 to 26.8 is a difference of 2.2 so 2.2/2.6 seconds.
Alternatively use the equation;
v
=
u
+
a
t
where v is the final velocity, u is the initial velocity, a is the acceleration and t is the time. You can rearrange this to give you:
t
=
v
−
u
a
which will give you the same answer.
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