Impetus (noun): Something that makes a process or activity happen or happen more quickly. (प्रोत्साहन , प्रेरना)
Synonyms: Incitement, Motivation, Incentive, Stimulus
Antonyms: Hindrance, Blockage, Deterrent
Example: The reward money should be sufficient impetus for someone to come forward with information about the robbery.
It was the progressive improvement in the fabrication of IEDs and car bombs in the wars in Syria, Iraq and Afghanistan and the internal security environment of Pakistan that probably gave an impetus to perceptions about their potential usage once again in Kashmir.