the answer is the result of :
(1.5 x 2.5)/(0.3048 x 0.3048) sq feet
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If the acceleration was constant (15 + 25) /2 = 20 (time does not figure into the averaging at all!)
Average acceleration = (change in speed) divided by (time interval)A = (40 - 25) / 15 = 15/15 = 1 meter/sec2
25 metres.
3.3sq.feet
3