Question

A ball dropped vertically falls d, in t seconds

d is directly proportional to the sqaure of t
the ball drops 80 in 4 seconds
how far does the ball drop in the next 8 seconds

Answer 1

`\qquad \qquad \textit{direct proportional variation} \\\\ \textit{\underline{y} varies directly with \underline{x}}\qquad \qquad \stackrel{\textit{constant of variation}}{y=\stackrel{\downarrow }{k}x~\hfill } \\\\ \textit{\underline{x} varies directly with }\underline{z^5}\qquad \qquad \stackrel{\textit{constant of variation}}{x=\stackrel{\downarrow }{k}z^5~\hfill } \\\\[-0.35em] ~\dotfill`

`\stackrel{\textit{`