A 0.25 kg ball moves on a smooth horizontal surface with components of velocity 6 m s⁻¹ along the line of impact and 3 m s⁻¹ perpendicular to it. It collides with a 0.35 kg ball moving in the same directions with components 2 m s⁻¹ (along impact) and 1 m s⁻¹ (perpendicular). The coefficient of restitution is 0.8. How much kinetic energy is lost during the collision?
a) 0.84J
b) 0.23J
c) 0.42J
d) 0.36J