Two similar buses are moving with the same velocity on the roads one of them is empty and other is loaded with passenger. which of the two will stop by the application of less force. explain

A force of ANY size can stop EITHER bus. The only question is: How SOON does it need to stop ? If you need both buses stopped in the same amount of time, then it'll take less force to stop the empty bus in THAT time.

(Because Mass x Speed = Momentum, so the empty bus has less momentum, so it requires less impulse to stop, and

Impulse=Force x Time.)