Which statements explain how a maglev train can reach over 300 mph? Choose THREE correct answers A. Repelling magnetic forces can lift or levitate a mag-lev train off the ground to minimize friction B. Electromagnet motors can increase speed more efficiently than motors with metal gears C. Attracting magnetic forces can liſt or levitate a mag-lev train off the ground to minimize friction D. Only repulsive magnetic forces can propel mag-lev vehicles forward

Well it depends on the object or substance

The figure is missing but we can answer anyway.the correct answer is "releasing the string". in fact, when the person is holding the bow and the arrow, the kinetic energy of the arrow is still zero (because the arrow is not moving). the moment the arrow is released, it acquires a velocity v, so its kinetic energy will become different from zero: where m is the mass of the arrow and v its velocity.  all the other options, instead, do not increase the kinetic energy of the system: -  pulling farther back on the string : this will just increase the elastic potential energy of the system-  holding the arrow higher: this will increase the gravitational potential energy of the system (which is given by u=mgh, where h is the height above the ground)-  decreasing the mass of the arrow: this will decrease the gravitational potential energy of the system (which is given by u=mgh, where m is the mass)

The inference is supported by evidence in the graph is this is an exothermic reaction where the total release of energy equals a + c.

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