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**Acceleration question BASIC PHYSICS HELP :(**

Question1: A ball rolls with an acceleration of 20.5m/s^2. If it stops after 7s, what was its initial speed ? (Answer 3.5 m/s )

Question2: A wheelchair marathoner has a speed of 5m/s after rolling down a small hill in 1.5 s. If the wheelchair underwent a constant acceleration of 3m/s^2 during the descent , what was the marathoners speed at the top of the hill ? (Answer: 0.5m/s)

Question3:

What does it mean when it says in a problem: "at a 45* angle from due East and from due North" ?

Please, please help me figure those questions out with explanation.

Very much appreciate your help.

Thank you in advance