Imagine you are on the top of a mountain with four basketballs. the mass of the four basketballs are 100 kilograms, 200 kilograms, 300 kilograms, and 400 kilograms. if the basketballs rolled down the hill, which one would supply the greatest force at the bottom of the mountain (assume that their velocities were equal at the bottom of the mountain)?
a) 100 kilogram basketball
b) 200 kilogram basketball
c) 300 kilogram basketball
d) 400 kilogram basketball

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.