Задача 10867.

On a body moving at a speed of 5 m / s, starts a force of 5 N. As a result, during the time t of the force equal to 4, its kinetic energy increases by 120 J.. Find the speed of the body at the end of the force and its weight.

Detailed solution shorthand terms, formulas and laws used in the decision, the withdrawal of the calculation formula and the response.
If you have any questions to address, please. I try to help.