An element’s mass number tells the number of protons in its nucleus true or false?

The metric unit of electrical power is the watt volt ampere ohm

The softest and hardest minerals are: softest hardest

Which of the following situations is impossible? a) an object has velocity directed east and acceleration directed east. b) an object has zero velocity but non-zero acceleration. c) an object has constant non-zero velocity and changing acceleration. d) an object has velocity directed east and acceleration directed west. e) an object has constant non-zero acceleration and changing velocity.