If someone throws a ball down from a height of 100 meters, the ball's distance from the ground can be modeled by the equation: d = − 9.8 t 2 − 15 t + 100 where t is the time in seconds and d is the distance in meters. At what time (t) will the ball hit the ground? (Hint: what does this mean for d=distance?) You will get two answers. Do both make sense? (Explain in detail Why or Why not

The ball will hit the ground when t = 2.52s. The other answer, which is t = -4.05s, does not make sense, because the answer is an instant of time, and there are no negative time measures.

Step-by-step explanation:

To solve this question, we have to find the roots of a quadratic equations, which is explained next.

Given a second order polynomial expressed by the following equation:

.

This polynomial has roots such that , given by the following formulas:

In this problem, we have that:

Ball's distance from the ground.

So

At what time (t) will the ball hit the ground?

This is t when . So

The ball will hit the ground when t = 2.52s. The other answer, which is t = -4.05s, does not make sense, because the answer is an instant of time, and there are no negative time measures.

"if it is my birthday, then it is snowing"

typically if you want , you would actually put questions here for us to you. but hey, that's just me. maybe someone will magically answer the questions for you without knowing what they are.