self Maths Puzzle

5+2+3=101522 How?

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self Other Question

his is just a formula for the height of an object shot straight up into the air. i found it in my math text book. height equals meters per second subtracted by 4.9 seconds squared. the puzzle is why does the formula use 4.9 instead of 9.8 and why are the seconds squared.
H=height
m=meters
s=seconds
H= ms - 4.9ss a number has 2 at its unit place ,when it is doubled we get the same number but 2 shifted from unit place to starting of number. find the number