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so i am going to use of energy, and since it is an elatic collison, it will be kenitic energy

.5m1v1i^2+.5m2v2i^2=.5m1v1f^2+.5m2v2f^2

since the mass of the bat is much larger than that of the ball, i am going going to use

v1i+v2i=v1f+v2f

so, if the bat and ball are approching eachother at the same speed i am going to take the ball approching the bat to be negitive, so i have

1.7-1.7=v1f+v2f

the answer isn't 0....so this is where i am stuck