Question

a body has an average speed of 30m/s. If its final speed is 40m/s, did the body start from rest or motion? if it started from motion what was its initial speed?​

Answer 1

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Answer 2

QUESTION →

A body has an average speed of 30 m/s. If its final speed is 40 m/s, did the body start from rest or motion? if it started from motion what was its initial speed?​

ANSWER →

As we know that,

$\rm{Average\ speed=\dfrac{Initial\ speed+Final\ speed}{2} }$

• Average speed = 30 m/s
• Final speed = 40 m/s

Putting the values, we get :-

$\rm{30=\dfrac{Initial\ speed+40}{2} }\\\\\rm{\implies Initial\ speed+40=60}\\\\\bigstar\ \rm{\implies Initial\ speed=20\ m/s}$

◘ Hence, the initial speed of the body is 20 m/s.

◘ As the initial speed is not 0, so the body started from motion.

$\rule{180}{1.7}$

Hope this helps :)