A rock with mass 2.0 kg is at rest on a horizontal frictionless surface. A bullet with mass 0.100 kg is traveling due east with a speed of 400 m/s just before it strikes the rock. Just after the collision between the bullet and the rock, the bullet is moving south with a speed of 300 m/s. What is the speed of the rock just after the collision with the bullet?
A) 5.0 m/s
B) 15.0 m/s
C) 25.0 m/s
D) 59.2 m/s
E) None of the above answers
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