Si ustedes empujan juntos una caja de 50 kg a lo largo de una superficie horizontal, y el ángulo con el que aplican sus fuerzas es de 40°. Consideren que entre los dos pueden aplicar una fuerza conjunta de 250 N, ¿cuál es la com- ponente horizontal de dicha fuerza?, ¿con qué aceleración se moverá la caja?

probably not if net force is zero

answercollision;

chemical energy --> gravitational potential energy --> kinetic energy --> elastic potential energy --> gravitational potential energy

explanation:

when emma starts the hike, the chemical energy stored in her body is used to climb up the mountain, and so she gains gravitational potential energy (because at the end, she will be at a higher height h above the ground). then she goes bungee jumping: as she falls, this gravitational potential energy is converted into kinetic energy (because her speed increases as she falls down), until the point when the rope stretches, and she stops moving. at that moment, all the kinetic energy is converted into elastic potential energy due to the stretching of the rope. then, this energy is released because the rope returns to its natural length, and emma gains a small increase in altitude , so she gains some gravitational potential energy.