The body falls freely from a height of 80 m. What is his movement in the last second of the fall?

1. Let’s compose the equation for finding the fall time (the acceleration of gravity g will be taken equal to 10 m / s ^ 2):

80 = g * t ^ 2/2;

160 = 10 * t ^ 2;

t ^ 2 = 160/10;

t ^ 2 = 16;

t = 4;

2. The entire flight of the body was 4 seconds. Let’s find the distance that the body flew in 3 seconds:

10 * 3 * 3/2 = 45 meters;

3. Let’s find the movement of the body in the last second:

80 – 45 = 35 meters;

Answer: the movement of the body in the last second is 35 meters.