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(a) Write the formula for acceleration. Give the meaning of each symbol which occurs in it.
(b) A train starting from Railway Station attains a speed of 21 m/s in one minute. Find its acceleration.
(a). Acceleration: The rate of the change of the velocity with time is known as acceleration. It is denoted by $a$.
Formula for acceleration:
acceleration $\boxed{a=\frac{v-u}{t}}$
$u\rightarrow$ initial velocity
$v\rightarrow$ final velocitty
$t\rightarrow$ time
(b). As given, a train starts from the 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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