Trolley X of mass 2.0 kg is moving to the right at 2.0 m/s. Trolley Y of mass 1.0 kg is moving to the left at 1.0 m/s. The trolleys collide and stick together. The collision takes a total time of 0.20 s. What is the average force acting on trolley X during the collision?

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✓ Correct answer
B: 10 N
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