Which of the following is another way to say that, in energy transforms, some energy is always converted unusable or unwanted forms?

a. the entropy of a system tends to decrease overtime.
b. energy transforms are never 100% efficient
c. the energy in a system is always constant
d. energy transfers are always 100% efficient

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.

the maxium height is 34m/s