Question

A body covers first one-third of the distance with a velocity 10 m/s in same direction, the second one-third with a velocity 20 m/s and last one-third with a velocity of 30 m/s. The average velocity of body is?

Answer 1

Average velocity = displacement /  total time 

Let the displacement = s 

$\frac{s}{ \frac{s}{3.10}+ \frac{s}{3.20} + \frac{s}{3.30} }$

$\frac{s}{ \frac{s}{30} +\frac{s}{60} +\frac{s}{90} }$

$\frac{s}{s( \frac{1}{30} +\frac{1}{60} +\frac{1}{90} )}$

$\frac{1}{ \frac{6+3+2}{180} }$

$\frac{1}{ \frac{11}{180} }$

180/11 = 16.36 m/s 

Answer 2

Answer:

the answer is 16.36 m/s