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Marys 40 kg brother is at rest on a swing 0.50 m off the ground. She pulls him up until he is 2.0 m off

Mary’s 40 kg brother is at rest on a swing 0.50 m off the ground. She pulls him up until he is 2.0 m off the ground and releases him. How fast is her brother moving after he passes the bottom and has gone up to 1.5 m off the ground?

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