[填空题]
The downward speed, V, in metres per seco4)d a+ky:),k1;g nj ud i,x pk;whjkgend, of a/76r84cxak lcp )mi ae l:ut/c skydiver t seconds after a jump from a xll mr:iea)/cutp76k8ca4/ cplane is modelled by the piecewise function
1.Show that K=60.
2.Draw the graphs of y=60−$\frac{60}{t+1}$, for t≥0, and y=12+$\frac{46}{t-28}$, for t>28,
on the grid below.
3.Find the time T at which the skydiver opened their parachute.
4.Calculate the speed of the skydiver after:
(1)10 seconds; V ≈ m sec$^{-1}$
(2)32 seconds. V ≈ m sec$^{-1}$
Assume that the skydiver's parachute failed to open.
5.Write down the terminal downward speed of the skydiver. m sec$^{-1}$
