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A train starting from Railway Station attains a speed of 21 m/s in one minute. Find its acceleration.
As given, a train starts from railway station.
Therefore, its initial velocity $u=0$
Final speed $v=21\ m/s$
Time take $t=1\ minute=60\ sec.$
Therefore, acceleration $a=\frac{v-u}{t}$
$=\frac{21-0}{60}\ m/s^2$
$=\frac{21}{60}\ m/s^2$
Thus, acceleration is $\frac{21}{60}\ m/s^2$.
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