In the show Trunks powered up to Ultra Super Saiyan, and was stronger than Cell but not fast enough to hit him. It occurred to me. In a test of strength, like an arm-wrestling match or a weight-lifting contest, could a USSJ beat a Super Saiyan 2?
That can't be determined because we don't know the physical feats of Ultra Super Saiyan versus a Super Saiyan 2.
We do however know that Trunks became physically stronger but did not increase his speed when he achieved USSJ.
Super Saiyan 2 is both physically stronger and faster, though it is unspecified whether or not USSJ is physically stronger than SSJ2... But as somebody commented the power level of SSJ2 is more than that of the USSJ.