The engine of a small trailer special, mass 10 tons, exerts a force parallel to its displacement and in the same direction, variable as shown below. Determine the final speed of this trailer, in km/h, at the end of the 20 m displacement, if its initial speed is 7 km/h

The engine of a small trailer special, mass 10 tons, exerts a force parallel to its displacement and in the same direction, variable as shown below. Determine the final speed of this trailer, in km/h, at the end of the 20 m displacement, if its initial speed is 7 km/h

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Question

The engine of a small trailer
special, mass 10 tons, exerts a force
parallel to its displacement and in the same direction,
variable as shown below.
Determine the final speed of this trailer, in
km/h, at the end of the 20 m displacement, if its
initial speed is 7 km/h.