EXPLANATION:
The acceleration of the line is the change of velocity divided by the elapsed time.
In this case the final velocity of line D is 0 and the initial velocity of line D is 20 so 0-20= -20. Since this number is negative, it is actually known as deceleration.
ANSWERS:
Therefore your acceleration of line D should be -20.
The other answer would be C, B, and D.
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