Calculate the average speed of a complete round trip in which the outgoing 220 k

Question

Calculate the average speed of a complete round trip in which the outgoing 220 km is covered at 97 km/h, followed by a 1.0-h lunch break, and the return 220 km is covwred at 50 km/h Due: 09/29/17 art Score: 17.9% Express your answer to two significant figures and include the appropriate units. Items 1 Problem 204 2 Problem 209 3. Problem 2 12 cm . 65 Submit Manswers Greue Problem 2 22 5 Chapter20 Problem 226 preen 240 Incorrect Try Again; 2 attempts remaining Part B Calculate the average velocity of the trip Express your answer to two significant figures and include the appropriate units 9 Chapter 2 10 Problem 2 Value Units to search

Explanation / Answer

Part A :

We know that;
[Average Speed = Total Distance/Total Time]

Step 1:
Total Distance = 220+220 =440km

Step 2:
Total Time = (220/97) + 1 + (220/50) = 7.668hours

Step 3:
Therefore;
Average Speed = 440/7.668 = 57.381 km/hr
= 1594 cm/s

Part B:

We know that;
[Average Velocity = Total Displacement/Total Time]

Because its a round trip therefore Total Displacement is "Zero", hence Average Velocity is also "0 cm/s".

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