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posted by Simeon .
4.The brakes are applied at the end of the 100s and the car comes to a stop within 20m, slowing down at a constant rate. What is acceleration?
5.Now the car turns back and its speed increases at 5m/s^2 for 7s. What is its speed at the end of 7th second? What its velocity at the end of the 7th second?

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You have omitted critical information needed to compute the velocity when the brakes are applied.
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