Which statement best expresses Newton's first law of motion? Objects are constantly speeding up or slowing down.
All objects resist changes to their states of motion.
For every action, there is an equal and opposite reaction.
The forces that cause objects to move will decrease over time.

The content of manganese (mn) in steel was determined spectrophotometrically and with the use of the standard addition method. an unknown sample of mn from a digested steel sample gave an absorbance of 0.185 when analyzed spectrophotometrically. when 5.00 ml of solution containing 95.5 ppm mn was added to 50.0 ml of the unknown steel solution (digested sample), the absorbance was 0.248. calculate the concentration, in parts-per-million (ppm), of mn in the digested steel sample solution.