u = initial velocity / ms-1, v = final velocity/ ms-1, a = acceleration/ ms-2 , s = displacement/ m, t = time taken / seconds.
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Notice that one of the five letters, u, v, a, s, t, is missing from each equation.
Call the first, ,
the no "s" equation,
the second, ,
the no "v" equation,
and the third, ,
the no "t" equation.
In any particular problem, use the following table:
Fill in whatever numbers you can. Put a question mark under the quantity you
have to find.
If there is a blank under, e.g. v, you would use the no "v"
equation .
EXAMPLE
A car is travelling at 10 ms-1. It accelerates at a rate of 4.5 ms-2
for a distance of 125 m.
Find its velocity at the end of this distance.
ANSWER
Here there is a blank under t. So, we use the no "t"
equation: .
Substituting, we find:
