SOLUTION: If a rock falls from a height of 40 meters on Earth, the height H (in meters) after x seconds is approximately
H(x) = 40 - 4.9x2.
When does the rock strike the ground? Round to
Algebra.Com
Question 130784: If a rock falls from a height of 40 meters on Earth, the height H (in meters) after x seconds is approximately
H(x) = 40 - 4.9x2.
When does the rock strike the ground? Round to the nearest hundredth, if necessary.
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
If a rock falls from a height of 40 meters on Earth, the height H (in meters) after x seconds is approximately
H(x) = 40 - 4.9x2.
When does the rock strike the ground? Round to the nearest hundredth, if necessary.
--------------
Let H(x) = zero and solve for "x".
40 - 4.9x^2 = 0
4.9x^2 = 40
x^2 = 40/4.9
x^2 = 400/49
x = 20/7
x = 2.857...
Cheers,
Stan H.
RELATED QUESTIONS
If a rock falls from a height of 20 meters on Earth, the height H (in meters) after x... (answered by ewatrrr)
if a rock falls from a height of 37 meter on earth, the height H (in meters) after x... (answered by solver91311)
If a rock falls from a height of 20 meter on the planet Jupiter, its height H (in meters) (answered by lynnlo)
A man is standing on a rock and shoots a firework into the air. The path of the firework... (answered by ikleyn,josmiceli)
A launched rocket has an altitude in meters, given by the polynomial h+vt-4.9^2, h is the (answered by stanbon)
I need help on this problem:
An object's altitude, in meters, is given by the... (answered by solver91311)
A rock is launched from a cannon its height, h(x), can be represented by a quadratic... (answered by ankor@dixie-net.com)
A Rock is launched from a cannon. Its height, h(x), can be represented by a quadratic... (answered by josgarithmetic)
A hovercraft takes off from a platform.Its height (in meters), x seconds after takeoff,... (answered by carrollmary87,ikleyn,Alan3354,greenestamps)