Acars porition in feett zeconds after it soving is given by t-et/i The average r

Question

Acars porition in feett zeconds after it soving is given by t-et/i The average rate of change in position with respect to time is celled average velocity i) Find the cars average valoory over tha n ’ seoond DO NOT INCLUDE UNITS WITH YOUR ANSWER. n) Find the cars averaga velonty fromt 15 o25aco DO NOT INCLUDE UNITS WITH YOU ANSWER ia) what units would your answers from parts i and i be in? O A. seconds per toot par toot 0 B. feat per seoond OD. O E- OF, seconds teat per seoond per second saconda per 100c Click to select your answens)

Explanation / Answer

a)

s(0) = 9(0)*(0)^(0.5) = 0

s(9) = 9(9)*(9)^(0.5) = 243

average velocity in first 9 seconds = [s(9)-s(0)]/(9-0) = (243-0)/(9-0) = 27

b)

s(16) = 9(16)*(16)^(0.5) = 576

s(25) = 9(25)*(25)^(0.5) = 1125

average velocity from t=16 seconds to t=25 seconds = [s(25)-s(16)]/(25-16) = (1125-576)/(25-16) = 61

c) Since the distance is given in feet

Hence the average velocity unit will be feet per second

Therefore correct answer is Option B

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