Question

calculate average velocity of an object which starts from rest and gain a speed of 30 m/s while moving in a straight path for 2 sec
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Answer 1

time=2sec.=t

initial velocity=0m/s=u

final velocity=30m/s=v

Average velocity=total displacement/total time

=v-u/t

=30m/s/2s

=15m/s

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Answer 2

$average \: velocity = \frac{displacement}{total \: time} \\ \\ u = 0m {sec}^{ - 1} \\ v = 30m {sec}^{ - 1} \\ t = 2sec \\ \\ v = u + at \\ \\ 30 = a(2) \\ \\ a = 15m {sec}^{ - 2} \\ \\ {v}^{2} = {u}^{2} + 2as \\ \\ {30}^{2} = 0 + 2(15)s \\ \\ 900 = 30s \\ \\ s = 30m...........t = 2sec.... \\ \\ average \: velocity = \frac{30}{2} \\ \\ average \: velocity = 15m {sec}^{ - 1}$

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