Five identical steel spheres, each of mass 0.10kg, hang in contact as a Newton’s cradle. One sphere at an end is lifted so its center rises 0.20m and is then released from rest. Neglecting all nonconservative effects, what is the speed of the sphere that departs from the opposite end immediately after the sequence of collisions?
a) 1.4m/s
b) 4.0m/s
c) 2.0m/s
d) 0.98m/s