Does Gandhi use elements of logos, pathos, or ethos in this speech?
Yes, he does. These three rhetorical devices (logos, pathos, and ethos) are persuasive devices. Mahatma Gandhi uses these elements in order to call Indian's attention. The use of 'ethos' is to generate credibility in his audience. So he puts himself at the same level of Indians. The use of 'pathos' is to create an emotional atmosphere and the use of 'logos' is a tactic to develop a plan of action.
Cite evidence of one or more of these elements of rhetoric from the speech:
“We have resolved to utilize all our resources in the pursuit of an exclusively non-violent struggle. Let no one commit a wrong in anger.” Dandi March Speech (11 March 1930)
In this excerpt, you have the use of ethos: We (Gandhi includes himself), the use of logos because he wants Indians not to fight but resist against the British government. And finally, the use of pathos because Gandhi persuades Indians with 'Satyagraha' causing the Indian independence movement, which will be the basis in the Civil Rights Movement.