A body with mass m = 2.8 kg and negligible dimensions is supported (but not attached) to a spring of elastic constant k1 = 5.2 N / m kept compressed at a distance d = 7.8 m by a bolt, as shown in the following figure . Point A in the figure indicates the position where the spring is relaxed. At a distance L = 1.2 m from this point there is another spring, relaxed, of elastic constant k2 = 8.9 N / m. Both springs are ideal and the potential energy of the springs is zero when relaxed. In the region to the right of A and to the left of B (in blue in the figure), the coefficient of kinetic friction between the plane and the body is µC = 0.4. In the region to the left of A and to the right of B (in black) friction is negligible. Suppose the acceleration due to gravity is 9.8 m / s2 and the mass of the springs is negligible. The bolt is released and the body moves. What is the body speed when it gets to B? Choose one: a) 20,4 m/s b) 15,9 m/s c) 10,2 m/s d) 5,1 m/s e) 14,3 m/s f) 3,1 m/s g) 14,2 m/s

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Spring Potential Energy

The potential energy is the energy possessed by a body by virtue of its position or the energy held by the object due to its position relative to other objects, its force like stresses, charge, and other factors affecting the particles of the body. The potential energy is the measure of the net work done by or on the body. The spring potential energy is the potential energy stored due to the deformation of an elastic spring and this elasticity is due to the stretched spring. The elasticity is the ability of a solid-state matter to come back to its equilibrium position or original position after any kind of external force is acted on it. It is also known as Elastic potential energy. The potential energy here is caused due to the displacement of the spring from its equilibrium position to another position and this potential energy is equal to the net work done due to the stretching of the spring. It also resembles the same mechanics of the oscillation of a simple pendulum, where due to the external force, the object moves from its equilibrium position to its maximum ends and the periodic motion continues till it comes back to the equilibrium position to rest.