The height h (in m) of a fireworks shell shot vertically upward as a function of time t (in s) is h 4 9t 2 68t 2 How long should the fuse last so that the shell explodes at the top of its trajectory

Question: The height h (in m) of a fireworks shell shot vertically upward as a function of time t (in s) is h = 4.9t 2

The height h (in m) of a fireworks shell shot vertically upward as a function of time t (in s) is h = −4.9t² + 68t + 2. How long should the fuse last so that the shell explodes at the top of its trajectory?

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