The third option is wrong
Answer:
Change in Velocity because

Explanation:
Remeber area is length times Width. In this case, the area under a accleraton vs time graph is Accleration Times Time. Which is velocity
Average Velocity= displacement/time Av=50/0.50 Av=100
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Newton's first law of motion states that. an object on the rest or motion is stay the same unless external force applied on it.