Help please ASAP I don’t understand anything

In science and physics what is the standard unit of measure for speed?

For waves in the ocean, the medium of the waves is a. air b. water c. energy d. a passing boat

The electric potential v is constant everywhere within a certain region of space. which statement below is true? the choices are: the electric field is also constant (but not zero) within the region. a charged particle placed within the region will experience an electric force. the electric field is zero everywhere within the region. the electric field varies from place to place within the region.