SOLUTION: h=-4.9t^2+12t+45
the object is at a height of 45m. What amount of time will it take to hit the ground?
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Question 1040284: h=-4.9t^2+12t+45
the object is at a height of 45m. What amount of time will it take to hit the ground?
Answer by ikleyn(52781) (Show Source): You can put this solution on YOUR website!
.
h = -4.9t^2+12t+45
the object is at a height of 45m. What amount of time will it take to hit the ground?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
It will hit the ground when h = 0.
To find t, solve this quadratic equation
= .
Use the quadratic formula (see the lessons
- Introduction into Quadratic Equations
- PROOF of quadratic formula by completing the square
in this site).
For similar problems see the lessons
- Problem on a projectile moving vertically up and down
- Problem on an arrow shot vertically upward
- Problem on a ball thrown vertically up from the top of a tower
- Problem on a toy rocket launched vertically up from a tall platform
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