A constant force F = 0.8N acts on a body with a mass of m = 16 kg for a time t = 4s. find the final kinetic energy of the body

A constant force F = 0.8N acts on a body with a mass of m = 16 kg for a time t = 4s. find the final kinetic energy of the body, if before the action of the force F the body was at rest, i.e. its initial kinetic energy was zero.

According to Newton’s second law, the force F acting on the body is F = ma. Recall that acceleration is the change in speed over time, that is, a = (V = V0) / t. If the body is at rest, then its initial velocity is 0. Then we can write:
F = mV / t. Hence the speed V = Ft / m.
End kinetic energy at speed V:
E = 0.5mV ^ 2
Let’s plug the speed into the formula:
E = (Ft) ^ 2 / 2m = 0.32 J