3 years ago

PLEASE HELP!!! I will give BRAINLIEST!!!

Mathematics

1 answer:

Rom4ik [11]3 years ago

8 0

Answer:

first one yes s no third no fourth yes fifth no

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Answer:

<em>t = 5 seconds</em>

Step-by-step explanation:

We must solve the equation of movement of the ball as a function of time in seconds.

We must find how many seconds it takes until the ball touches the ground. When the ball touches the ground, the height b (t) = 0

Then we equate the equation to zero and solve for t.

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Use the quadratic formula.

Where

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$t = \frac{-b \±\sqrt{b^2-4ac}}{2a}\\\\\\t_1 = \frac{-(80)-\sqrt{(80)^2-4(-16)(3.5)}}{2(-16)}\\\\t_1= 5.04\ s\\-------------------------\\t_2 =\frac{-(80)+\sqrt{(80)^2-4(-16)(3.5)}}{2(-16)}\\\\t_2=-0.0434\ s$

We take the positive solution

<em>t = 5 seconds</em>

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