How does energy transfer through balls? Basketball and tennis ball used. The research 3-4 pages typed and works-cited 5-6 sources. 12 point, times roman, 1.5″ line spacing. 1″ margins on top, bottom & right side. 1.5″ on left side. Paragraphs 6-8 sentences long. No contractions. Entire research paper must be written in 3rd person, and be a factual account of the subject matter. Should only be facts. You may use subheadings to help the flow of the paper.