Question

65 kg pole vaulter running at 10.2 m/s vaults over the bar. if height of bar was set at 4.96 m how fast was he moving as he cleared the bar

Answer 1

If he cleared the bar at the top of his swing, then all his speed was horizontal, at 10.2 m/s.

All that stuff about mass and height is just noise. Trying to incorporate other forces is impossible without further data.