When a whole brick falls free from the roof of a house, it reaches the ground in 2 seconds.

When a whole brick falls free from the roof of a house, it reaches the ground in 2 seconds. How long will it take half a brick to fall from the same roof?

Since the time of the body falling to the Earth’s surface does not depend on the mass tuj, the half of the brick will also fly to the ground in 2 s.

Proof: a) Distance covered: S = H = g * t ^ 2/2, whence t = √ (2H / g), that is, the fall time depends on the initial height and the acceleration of gravity.

b) The law of conservation of energy: Ek = En and m * V ^ 2/2 = m * g * h; V ^ 2/2 = g * h; (a * t) ^ 2/2 = g * h; g ^ 2 * t ^ 2/2 = g * h and t = √ (2 * h / g).

Answer: a) half of the brick will reach the ground in 2 seconds.