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?
Please note the correct spelling of the subject.
We will be glad to critique your work.
You have omitted critical information needed to compute the velocity when the brakes are applied.