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G: s or v = 20 m/s; d = 150 m
R: acceleration
E: a =  \frac{v_{f} -  v_{i} }{t}
S: In this case, we don't have the time so we're going to solve for the time first.
t =  \frac{d}{s/v}
 \frac{150 m}{20 m/s}
7.5 s

So we already have the time, which is, 7.5 s. Now, we can already solve for the acceleration.
a =  \frac{v_{f} -  v_{i} }{t}
 \frac{20 m/s - 0 m/s}{7.5 s}
 \frac{20 m/s}{7.5 s}
2.667 m/ s^{2}

Or we can convert them into their significant values. In this case, the lowest SF is 1 so we round it off in its 1 SF.
2.667 m/s^{2}
3 m/ s^{2}

A: 3 m/ s^{2}
1 5 1