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Ksenya-84 [330]
3 years ago
12

you drive in a straight line at 20.0m/s for 10.0 min, then 30.0m/s for another 10.0 min. Find the average speed.

Physics
1 answer:
Juliette [100K]3 years ago
6 0

Answer is 25 m/s.

<em>Explanation;</em>

<em>Step 1 : Convert the units into same unit.</em>

Here speeds are given in m/s while the time is in minutes. So, let's convert minutes into seconds.

1 min = 60 s

Then,

   10 minutes = 10 x 60 s = 600 s

<em>Step 2 :  Find the total distance that you have travelled.</em>

To find that you need to first find distances separately.

We know the formula, s = vt, where s is the distance, v is the speed or velocity and t is the time.

  • First you have travelled 10 minutes (600 s) at 20.0 m/s.

        Then distance, s = 20.0 m/s x 600 s = 12 000 m

  • Secondly you have travelled again 10 minutes at 30.0 m/s

        Then distance = 30.0 m/s x 600 s = 18 000 m

Then, the total distance = 12 000 m + 18 000 m = 30 000 m

<em>Step 3 : Find the total time taken to travel.</em>

Total time  = 600 s + 600 s = 1200 s

<em>Step 4 : Calculate the average speed.</em>

Average speed = total distance / total time

                          = 30 000 m / 1200 s

                          = 25 m/s


   

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