An object is kicked from a platform. The equation h represents this situation, where h is the height of the object above the ground, in meters, t seconds after it is kicked. Which numberrepresents the height, in meters, from which the object was kicked?
Correct answer: D. 9
- A. 0
- B. 4.9
- C. 7
- D. 9
Explanation
Choice D is correct. It's given that the equation h=_4.9 t represents this situation, where h is the height, in meters, of the object t seconds after it is kicked. It follows that the height, in meters, from which the object was kicked is the value of h when t = 0. Substituting 0 for t in the equation h = 4.9 t 2 + 7 t + 9 yields h = -4.9 (0)2 + 7 (0) + 9, or h =9. Therefore, the object was kicked from a height of 9 meters..
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