A volleyball player (weight = 600 N) lands from a spike attempt and immediately jumps up to try for a block. When she first contacts the ground, she is moving at 3 m/s, and then as she leaves the ground for the block she is moving at 4 m/s. Her kinetic energy at maximum knee flexion (i. e., at the end of landing, when her vertical velocity is 0 m/s) is:

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truck y has a greater velocity than truck x.

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