a race car starts from a rest and travels east along a straight and level track.

Question

a race car starts from a rest and travels east along a straight and level track. Exercise 2.14 Part A A race car starts from rest and travels east along a straight and level track. For the first 5.0 s of the car's motion, the eastward component of the car's velocity is given by uz(t) = (0.910 m/s)t2 What is the acceleration of the car when th = 167 m/s ? Express your answer with the appropriate units ali Submit My Answers Give U Incorrect: Try Again; 4 attempts remaining; no points deductes Enter your answer using dimensions of acceleration

Explanation / Answer

car velocity is given by

vx (t) = 0.910 t2

when vx = 16.7 m/s then

16.7 = 0.910 t2

t2 = 18.35

t=4.283 s

ax = d/dx (vx) = d/dt (  0.910 t2) = 1.82 t = 1.82*4.283 = 7.795 m/s2

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