- #1

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my attempt at this problem is to find the new model's acceleration by use F=ma, then use the kinematics Vf=Vo+at to find the period to be 8 sec. Then I can calculate the percentage by dividing the difference with the original period. But this somehow seemed to easy and I am not sure if it's right. Also, I would assume the impulse doesn't change since P=mv, but I am not sure on this.