Homework Answers
PRACTICE IT
v = 143 mi / h = 143 * 0.447 = 63.92 m/s
a = 12.1 mi/h/s = 5.409 m / s2
displacement at constant speed = 63.92 * 1.2 = 76.704 m
displacement while decelerating = 63.922 / 2 * 5.409 = 377.7 m
so,
total displacement = 454.38 m
---------------------------------------------------------
EXERCISE
Distance covered before brakes are applied = 57.6 * 1.99 = 114.62 m
so,
distance left = 562 - 114.62 = 447.38 m
so,
a = - 57.62 / 2 * 447.38
a = -3.71 m/s2
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