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A2 solutions: Newton's 2nd

1. A thin string is attached to a 5kg mass which is placed on a 1m high table. The string is so thin that it will break with a force of 40N so cannot be used to lift the mass. However if the mass is allowed to accelerate downwards the string can be used to lower the mass to the ground without breaking. Calculate the minimum speed that the mass will reach the ground if lowered in this way.Hint:Solution:

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