Question

Calculate the average velocity and average speed of a body initially moving with speed 30 m/s for 30 mins and then with a speed of 40m/s for next 20mins.

Answer 1

Here is your answer mate!

Explanation:

We know that ,

Avg speed = total distance / total time taken.

=total (s×t )/ total time

= (30×30+40×20) /(30+20)

=1700/50

=34m/s

Hope it will help you✌✌✌

❤❤❤❤

Answer 2

Answer:

Explanation:

Given,             u1 = 30m/s

                        t1 = 30min = 30*60 s = 1800 s

                       u2 = 40m/s

                       t2 = 20min = 20*60 s = 1200 s

since, average speed  = total distance traveled/total time taken

                                     = (u1*t1+u2*t2)/(t1+t2)

                                     = (30*1800+40*1200)/(1800*1200)

                                     = 10200/3000

                                      = 34m/s

since the  direction of the given body is not changing, therefore its average velocity is equal to its average speed which is 34m/s.