A ball is thrown from a height of 40 meters with an initial downward velocity of 5 m/s. The ball's height h (in meters) after 1 seconds is given by the following. h - 40 - 51-57
How long after the ball is thrown does it hit the ground?
PA
Round your answer(s) to the nearest hundredth.
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0=40-10t-5t^2

t^2+2t-8=0

(t+4)(t-2)=0

t=-4 (not a solution) or t=2

after 2 seconds

Step-by-step explanation:

First, set h (height) to 0, since that is the height we'll be solving for (at the ground). Factor the right side of the equation and set each individual binomial equal to zero. Solve for x in both equations and you should be left with a negative answer and a positive one. There is no negative time, so choose the answer that is positive.

definitely a. the others have almost all data points on one side of the line.

step-by-step explanation:

it is x=-4

step-by-step explanation: