Answer:
 A. 0.806 kN
 B. 0.303 kN
Explanation:
The kinetic energy of the ball is ...
 KE = 1/2mv² = 1/2(0.206 kg)(18 m/s)² = 33.372 J
The work required to reduce this to zero over a distance of 4.14 cm is ...
 W = Fd
 F = W/d = (33.372 J)/(0.0414 m) = 0.806 kN
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When the distance is 11 cm, the force is ...
 F = (33.372 J)/(0.11 m) = 0.303 kN