7/21/59-New York:  Provocative Jane Fonda, daughter of film star Henry Fonda, looks sultry as she poses here July 21st before boarding a TWA jetliner to Los Angeles. Miss Fonda, 20, is to co-star with Tony Perkins in her first movie role in "The Way The Ball Bounces."  She is five feet, eleven inches tall and measures 36-21-35.  She admits that being the daughter of a famous actor helps in breaking into show business.