Table:
text: Might and Power
Race record
1996-97 Season as a Three Year Old
Result_ Date_ Race Venue Group_ Distance Weight_kg Jockey Winner_2nd
2nd 01 Mar 1997 Canterbury Guineas Rosehill G1 1800 m 55.5 J. Cassidy 1st - Intergaze
7th 15 Mar 1997 Rosehill Guineas Rosehill G1 2000 m 55.5 J. Cassidy 1st - Tarnpir Lane
4th 29 Mar 1997 Australian Derby Randwick G1 2400 m 55.5 B. York 1st - Ebony Grosve

Question: What was the weight in kg when the jockey was a 3 year old in the 1996-97 season, race record was b. York under power and might?