A stone's height is h = 30t - 5t^2 m. It is at ground level again after:

  1. 6 s
  2. 3 s
  3. 30 s
  4. 5 s
Answer

A) 6 s

5t(6 - t) = 0 Rightarrow t = 6 s. SLO M-09-A-21 · Application

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