It's mean the theory that changes in the earth's crust during geological history have resulted from the action of continuous and uniform processes.
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She is making kinetic energy when she lifts the ball and when the ball is above her head the ball gains potential energy.
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u will equate and make V2 the subject because it's the one u are looking for ....
The amount of the solute is constant during dilution. So the mole number of HCl is 2*1.5=3 mole. The volume of HCl stock is 3/12=0.25 L. So using 0.25 L stock solution and dilute to 2.0 L.