What conditions must be met in order for work to be done? Check all that apply.
I A. At least part of the applied force must be in the same direction as
the movement of the object.
IB. The output force must be greater than the input force.
I C. The applied force must make the object move.
D. The work must be greater than the momentum.

the correct option is c.

isotopes refers to different forms of the same element with the same atomic number but different mass number as a result of difference in their neutron numbers. isotopes have different relative atomic mass but share the same chemical properties.

ca has a crystalline lattice with positive ions (since it is a metal, metals are positively charged) and electrons flow freely in its structure since the ca atoms have a large nuclear radius so the electrons are not tightly held, therefore the electrons can flow freely since they are not being highly attracted by the nucleus. moreover, one of the properties of metals are that they are conductors of electricity, thus proving ca is the element.