Your 'cq_1_02.1' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.
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The balls velocity should be on average around 7 cm/sec.
I have no idea if the ball is on an incline, or how long the ball is rolling for. There are many many factors not available that only make a guess possible.
d=rt
d=(7)(3)
d=21 cm
(10-4)/3sec=2 cm/sec
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5 min
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&#You need to insert your answers into a copy of the question. Otherwise when you refer to this document later, you won't remember what was being asked, and that might also be the case if I pose additional questions in my response. &#
(10-4)/3sec=2 cm/sec is not a correct calculation.
(10 cm/s -4 cm/s )/ (3sec) =2 cm/sec^2 is a correct caculation of average rate of change of velocity for this interval.
Otherwise very good.