WeBWorK Standalone Renderer

An object was shot up into the air at an initial vertical speed of $384$ feet per second. Its height as time passes can be modeled by the quadratic function $f$ , where $f(t)={-16t^{2}+384t}$ . Here $t$ represents the number of seconds since the object’s release, and $f(t)$ represents the object’s height in feet.

1) After , this object reached its maximum height of .

2) This object flew for before it landed on the ground.

3) This object was in the air ${14\ {\rm s}}$ after its release.

4) This object was ${1008\ {\rm ft}}$ high at two times: once after its release, and again later after its release.

(Use ft for feet, and s for seconds.)

You can earn partial credit on this problem.