Which statement about matter and energy agrees with the first law of thermodynamics?
matter and energy can be created, but not destroyed.
matter and energy can be both created and destroyed.
matter and energy cannot be created or destroyed, but can change from one form to another.
matter and energy can be destroyed, but not created.

Matter and energy cannot be created or destroyed, but can change from one form to another.

Explanation: According to first law of thermodynamics, energy of a closed system remains conserved and thus energy can neither be created nor be destroyed, it can only transform from one form to another.

= change in internal energy

q= heat absorbed or released

w= work done y or on the system

Thus change in energy is brought by work or heat which are also forms of energy. Thus energy gets transformed from on form to another.

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.

what is the actual question though?