In 10 seconds, a body weighing 1 kg changed its speed from 10 to 20 m / s. Determine the force acting on the body.

Given:

t = 10 seconds – the time interval during which the body changed its speed;

u1 = 10 meters per second – initial speed of the body;

u2 = 20 meters per second – the final speed of the body;

m = 1 kilogram – body weight.

It is required to determine F (Newton) – the force acting on the body.

Let’s find the acceleration with which the body was moving:

a = (u2 – u1) / t = (20 – 10) / 10 = 10/10 = 1 m / s2.

Then, to determine the force, it is necessary to use the following formula (Newton’s second law):

a = F / m, from here we find that:

F = m * a;

F = 1 * 1 = 1 Newton.

Answer: a force equal to 1 Newton acts on the body.