So inertia is also high at the start of the movement, zero when the barbell reaches peak velocity, and negative at the end of the movement. (strengthandconditioningresearch.com)
They found significantly smaller abduction angles at the start of the upwards movement and point of peak velocity during the narrow grip bench press compared with the middle and wide grips. (strengthandconditioningresearch.com)
They found significantly different peak angles at the start of the upward movement and the point of peak velocity between all conditions, insofar that the narrow grip showed the smallest extension angles and the wide grip showed the greatest. (strengthandconditioningresearch.com)