A stone is dropped from a helicopter hovering at a constant height of 490m. How long before the stone reaches the ground?
1 Answer
It takes
Explanation:
Well, you know that the gravitational force of the Earth is 9.8m/
We also know that the initial velocity of the object is 0m/s. And the displacement is 490m.
Most likely you know the big five equations of kinematics. In this example, we would use this equation:
Wee can now substitute in out givens and solve for
Therefore, It takes
Please note that when you take a square root of something you get a positive and a negative answer. It wouldn't make sense for time to be negative so we pick the positive answer.