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10. Driving a car in the positive direction at 60 mph, Mary tests her brakes by coming to a complete stop in 4 seconds. Then
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Answer #1

10.

Given that car is traveling at 60 mph for some time, after that Mary applies the brakes and stops car in 4 seconds, So in this duration acceleration of car will be in negative direction and after that when she speeds up for next 8 seconds acceleration will be in positive direction, So from given graphs only option C represents a graph when acceleration is negative before positive.

So Correct option is C.

11.

D = A + B + C

Using given values:

D = (-4 x + 1 y) + (3 x + 2 y) + (1 x - 3 y)

D = (-4 + 3 + 1) x + (1 + 2 - 3) y

D = 0 x + 0 y

D = 0

Correct option is A.

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