A person walks at a speed of 2.00 m/s for 10.0s and then walks at a speed of 1.50 m/s for 8.00 seconds. What is the average speed? I'm using the formula Average Speed=Total Distance/Total Time and I'm not getting the correct answer.

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Answer 1 · 2015-05-19T18:57:10

Total distance for the first 10 s = # s xx t = 2 xx10 = 20 "m"#

Total distance for next 8 s # = sxxt = 1.5xx8 = 12 "m"#

Therefore , total distance #d= 20+12 = 32"m"#

total time #t= 10 + 8 = 18 "s"#

So, avg. speed = #d/t = 32/18 = 1.78"m/s"#

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