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My attempt:

E=mv^2

E=(.210)(52.7)^2

E=583.2309J

Energy in the club after striking the ball

E=.210(41.4)^2

E=359.9316

The energy that is transferred to the golf ball = 583.2309-358.9316=223.2993J

Therefore the velocity must be 223.2993=.01v^2

v^2=22329.93

v=149.432

But this is wrong. What am i doing wrong?