document.write( "Question 1205874: A ball is thrown from the top of a building from a height of 75 feet
\n" ); document.write( "above the ground. The height of the ball, H, in feet from the
\n" ); document.write( "ground, and time, t, in seconds, can be modeled by the equation
\n" ); document.write( "H = −5(t−3)(t+5).
\n" ); document.write( "Select the true statement.
\n" ); document.write( "Ⓐ The ball reaches the ground in 3 seconds.
\n" ); document.write( "Ⓑ The ball reaches the ground in 5 seconds.
\n" ); document.write( "Ⓒ The ball reaches the ground in 15 seconds.
\n" ); document.write( "Ⓓ The ball reaches the ground in 25 seconds.
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Algebra.Com's Answer #842946 by ikleyn(52776)\"\" \"About 
You can put this solution on YOUR website!
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\n" ); document.write( "\n" ); document.write( "This equation in your post for height,   H(t) = -5(*-3)*(t+5),   does not work in feet,\r
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\n" ); document.write( "\n" ); document.write( "because its leading coefficient at  t^2  is  -5  ft/s^2.\r
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\n" ); document.write( "\n" ); document.write( "A correct equation for height in feet has the leading coefficient  -16  ft/s^2  at  t^2.\r
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\n" ); document.write( "\n" ); document.write( "When a person comes and claims that the height equation for a projectile has the form as it is written in your post,
\n" ); document.write( "it becomes clear that this person does not know the basics of  Physics (kinematics),  as well as the relevant part of  Algebra.\r
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