Which type of graph is best used to show how a measured quantity changes over time?
a box and whisker plot
b line graph
c circle graph
d histogram

Henry, whose mass is 95 kg, stands on a bathroom scale in an elevator. the scale reads 830 n for the first 2.4 s after the elevator starts moving, then 930 n for the next 2.4 s. part a what is the elevator's speed 4.8 s after starting? express your answer with the appropriate units.