Solve the problem.
-If a rock falls from a height of 70 meters on Earth, the height H (in meters) after x seconds is approximately $$H ( x ) = 70 - 4.9 x ^ { 2 }$$ When does the rock strike the ground? Round to the nearest hundredth, if necessary.
A) 14.29 sec
B) 2.92 sec
C) 3.78 sec
D) 1.71 sec

Question

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The Answer of Solve the problem.
-If a rock falls from a height of 70 meters on Earth, the height H (in meters) after x seconds is approximately $$H ( x ) = 70 - 4.9 x ^ { 2 }$$ When does the rock strike the ground? Round to the nearest hundredth, if necessary.
A) 14.29 sec
B) 2.92 sec
C) 3.78 sec
D) 1.71 sec

Solve the Problem H(x)=70−4.9x2H ( x ) = 70 - 4.9 x ^ { 2 }H(x)=70−4.9x2

Solve the Problem $H ( x ) = 70 - 4.9 x ^ { 2 }$