How to open the new terminal in the Command Prompt using docker

we are creating an application in docker

FROM ubuntu:18.04
CMD start cmd.exe – this the command to launch new terminal/console.
// as of now we are doing in windows / we have to do for ubuntu also.
// here we are facing an issue that new terminal/console is not launching -
could you please help me here.
// please kindly if any mistakes or did we missed anything in launching.

CMD ping