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   Solve for me this two Question, I'm kind of trouble with this questions. Please . Thank you

  

11) A rock is thrown straight up in the air at 6.2 m/s and it is released 1.8 m above the ground. Write an equation of motion to describe the height of the rock relative to the ground. (neglect air resistance and use g-9.8 m/s2) 12) A sprinter running a 100 m race starts at rest and accelerates at constant acceleration A for 3.0 seconds and then maintains a constant velocity. In terms of A, what is the position of the runner after 3.0 seconds? What is A if the sprinter finishes the race in 12.0 seconds?

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