A horizontal line means the object is. not changing its position it is not moving, it is at rest.
each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei, and hence differ in relative atomic mass but not in chemical properties; in particular, a radioactive form of an element.
Answer:
43,931,250J
Explanation:
energy required = mass × shc × change in temperature
