Question 8 (Mandatory) (1 point) The height, h, in metres, of a weather balloon above the ground after t seconds can be modelled by the function h (t) = -2t3 + 312 | 149t | 410, for Osts 10. When is the balloon exactly 980 m above the ground? O t = 5 s, t = 6 s, and t = 9.5 s Ot = 3 s and t = 5 s O t = 5 s and t = 6s Ot = 2sandt = 6s