4. How much force was required to bring granny's 1200-kg car to rest from 90 mph (40 m/s) in 2 seconds? чо 1200 14/2/2 = 2400 < ч ки 24 5. By the time granny's car (from the question above) had stopped from the applied force, how far had it travelled?

Q: Im confused on where you got the values in step 3. Also where did the the 12 and 52 come from?

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!