A car, initially traveling at 81.8 mi/h, slows to rest in 7.1 s. What is the car's acceleration?

a = -16.9 ft/s²

Explanation:

81.8 mi/hr(5280 ft/mi / 3600s/hr) = 120 ft/s

a = Δv/t = (0 - 120) / 7.1 = -16.9 ft/s²

if the initial direction is taken as the positive direction.

the entire statement is true and correct.  

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which three statements are true about all alloys?