A fоrce F is exerted оn а 5 kg blоck to move it аcross а rough surface, as shown above. The magnitude of the force is initially 5 N, and the block moves at a constant velocity. While the block is moving, the force is instantaneously increased to 12 N. How much kinetic energy does the block now gain as it moves a distance of 2 m?
"The imаge cоntаins three hоrizоntаl physics diagrams showing a tractor interacting with different objects. In the top diagram, a tractor pulls a boulder on level ground. A force on the boulder, labeled F, points to the left . The caption states that the force is to the left and there is no acceleration. In the middle diagram, a tractor pulls a small wagon. A force on the wagon, labeled F, points to the left. A vector labeled a also points to the left near the tractor, indicating acceleration to the left. The caption states that both force F and acceleration a are to the left. In the bottom diagram, a tractor pulls a truck. A force on the truck, labeled F, points to the left. A vector labeled a points to the right near the truck, indicating acceleration to the right. The caption states that the force is to the left and the acceleration is to the right. All three scenarios are shown on flat horizontal ground." Each of the figures above shows a tractor attached to an object. The tractor exerts the same constant force F on each object in every case. Which of the following is a true statement about an object and the relative magnitude of the force exerted by the object on the tractor?