The second law of thermodynamics states that (select one):

a. energy is the ability to do work.
b. useful energy is lost when converting from one form of energy to another.
c. energy can neither be created nor destroyed.
d. all energy is either kinetic or potential.

B

Explanation:

In converting energy from one form to another .useful enegy is lost in the process. It could also be defined in terms of entropy as this will not decrease over time I.e it is constant.

the chart show the masses and velocities of two colliding objects that stick together after a collision.

according to the law of conservation of momentum, the momentum of the object after the collision is  

answer

1,500

kg • m/s.