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How can I solve this? 1. Ayesha used 3500 J of energy to accelerate from rest to 8.0 m/s in 12 seconds on DMT's new

How can I solve this?

1. Ayesha used 3500 J of energy to accelerate from rest to 8.0 m/s in 12 seconds on DMT's new football field. What is her efficiency if her mass is 55 kg? What is her power? [3K]

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