How long does it take for a brick to reach the ground if thrown from a height of 65m?

Initial data: h (the height from which the brick was thrown, the distance covered by the brick) = 65 m; the fall of the brick is considered free.

Reference values: a (acceleration of a brick when falling) = g (acceleration of gravity) ≈ 10 m / s2.

The time it takes for a brick to reach the ground, we express from the formula: S = H = a * t ^ 2/2, whence t = √ (2 * H / g).

Calculation: t = √ (2 * 65/10) = 3.6 s.

Answer: The brick will reach the ground 3.6 seconds after the start of the fall.

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