ACT Science Practice Question #1531 (Medium (31)) | Test Citadel
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ACT Science Difficulty: Medium (31)

Digital ACT Science Practice Question #1531

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Two carts collided on a frictionless air track: - Cart A (1.0 kg, 3.0 m/s) collides with stationary Cart B (2.0 kg, 0 m/s) and they stick together. - Combined final velocity: 1.0 m/s Total momentum before collision was (1.0)(3.0) = 3.0 kg*m/s. Total momentum after was (3.0)(1.0) = 3.0 kg*m/s. Kinetic energy before was 4.5 J; kinetic energy after was 1.5 J. This collision is classified as:
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Kinetic energy lost (4.5 to 1.5 J) + carts stick = inelastic collision.

Masterclass Solution & Distractor Trap Analysis

When carts stick together and kinetic energy decreases (4.5 J -> 1.5 J) while momentum is conserved, it is an inelastic collision....

Distractor Analysis: Trap choice eliminates careless test-takers who confuse roots with coordinates...

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