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Answer:
0.375 seconds
Step-by-step explanation:
In simple terms, to find the time it took to reach the ground, we need to find t from the equation.
If we differentiate h with respect to t we will get the velocity with which the fireworks is moving at.
We can now equate this to its velocity and solve for t
10 = -32t +4
t = 0.1875 <em>( time cannot be negative in value, so we ignore the negative sign)</em>
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Therefore, the time it took the fireworks to reach the ground is = 2 x 0.1875= 0.375 seconds.
<em>(We need to account for the fact that the fireworks went up and came down)</em>