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Question
A ball of mass m attached to the lower end of a light vertical spring of force constant k. The upper end of the spring is fixed. The ball is released from rest with the spring at its normal (unstretched) length, and comes to rest again after descending through a distance x
- x = mg/k
- x = 2mg/k
- the ball will have no acceleration at the position where it has descended through x/2
- the ball will have an upward acceleration equal to g at its lowermost position
The correct answer is: the ball will have no acceleration at the position where it has descended through x/2
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