Question

A sport man make a jump ,the vertical position of his center of gravity can be expressed as the following ; y= 6 t3-5t2 +8t -20
He complete his motion at 20 sec

Answer 1

y=6t^3-5t^2+8t-20

If t=20 sec

y=6·〖20〗^3-5·〖20〗^2+8·20-20=46140