Because the speed has formula of distance divide time = m/s
and the acceleration is speed /time so (m/s)/s = m/(s*s) = m/s^2
hope this is understandably sure easy for you
To cover the width we need 12÷¾=12×4/3=16 tiles.
To cover the length we need 15×4/3=20 tiles, so to cover the floor area we need 16×20=320 tiles.
There are eight books total and he only grabbed two so the probability would be 2 out of 16 or 2:16
Square root it to cancel out the 2