Question

energy transfers and contact forces in the launcher, cart, box, and track system
energy remains constant with the launcher
energy is transferred from the cart to the launcher
there is no energy transfer
energy is transferred from the launcher to the cart

Explanation:

Step1: Analyze the system

In the given system of launcher, cart, box, and track, when the launcher acts on the cart (as shown in the sequence of states where the cart starts moving), according to the principle of energy transfer in physical systems (where a force - exerting agent like the launcher does work on the object it acts upon).

Step2: Determine energy transfer direction

The launcher, which has stored energy (e.g., elastic potential energy if it's a spring - like launcher), does work on the cart. Work done on an object is a form of energy transfer. When the launcher pushes the cart, the energy of the launcher (in the form of potential energy which gets converted) is transferred to the cart (as kinetic energy).

Answer:

Energy is transferred from the launcher to the cart