A man runs 800m due North in 100 seconds, followed by 400m due South in 80 seconds. Calculate, a. His average speed b. His average velocity c. His change in velocity for the whole journey

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A man runs 800m due North in 100 seconds, followed by 400m due South in 80 seconds. Calculate,

a. His average speed

b. His average velocity

c. His change in velocity for the whole journey

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