17. A Google Map Car traveling in northern Quebec, the one used to make \"Street

Question

17.

A Google Map Car traveling in northern Quebec, the one used to make "Street View" in Google, is going westward at 18 km/h while he records a moose that is moving westward 34 km/h faster than the car. Suddenly, the Moose sees the car and stops, turns, and then runs at 45 km/h eastward, as measured by a suddenly nervous Google driver who stands alongside the moose's path. The change in the moose's velocity takes 2.0 s. (Use east as the positive direction.) What is its acceleration from the perspective of the camera on the car? m/s2 What is its acceleration from the perspective of the nervous driver? m/s2

Explanation / Answer

vic = -18x5/18 = -5i

vim = -34x5/18 = -9.44i

vfm = -45x5/18 = 12.5i

t =2s

(A)

a =vfm -vim /t

a = [12.5i-(-9.44)]/2

a =10.97i

a =10.97m/s2

(B)

vfmC = vfm - vfC =12.5i-0 =12.5i

vimC = vim - viC = -9.44i +5i= -4.44i

a =vfmC -vimC /t

a = [12.5i-(-4.44)]/2

a =8.47 i

a =8.47 m/s2

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