Answer:
gradient m is 2
Step-by-step explanation:
the equation is y=mx+c therefore m is 2.
The toy rocket hits the ground when h(t) = 0.
So, h(t) = 0 = -9t^2 + 81.
Solving the equation,
-9t^2 = -81
Dividing by -9
t^2 = 9
Taking the square root.
t = 3
The answer is 3 seconds.
Answer:
A
Step-by-step explanation:
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Answer:
Step-by-step explanation: