Question

a greyhound can go from a state of resting to running at 19.44 meters per second in 1.54 seconds what is the greyhounds average acceleration A.12.62 m/s B.29.94 m/s C.12.62 m/s2 D.29.94 m/s2

Answer 1

You can eliminate options C and D outright since the units on acceleration are distance per time squared, ie
a∝m/s2

and since you know that, from rest, the velocity of an object is given by its acceleration multiplied by the time it underwent said acceleration
v=at

then
a=vt

So the answer is A.

Answer 2

\[v=a \times t\]
\[a=\frac{ v }{ t }\]
\[a=\frac{ 19.44m/s }{ 1.54s }\]
\[a=12.62m/s²\]

Alternative "C" is correct.