A body lowered from a certain height without an initial speed fell for 9 seconds. What is the speed of the body?

The speed of the body during uniformly accelerated movement can be expressed by the formula:

V = V0 + a * t, where V is the final velocity of the body (m / s), V0 is the initial velocity of the body (the body fell without initial velocity, V0 = 0 m / s), and is the acceleration of the body (a = g, g Is the acceleration of gravity (we take g = 10 m / s²), t is the fall time of the body (t = 9 s).

Let’s calculate the final speed of the body:

V = V0 + a * t = 0 + g * t = 10 * 9 = 90 m / s.

Answer: Before touching the ground, the body had a speed of 90 m / s.