Question
A point P lies on the axis of a ring of mass M and radius a, at a distance a from its centre C. A small particle starts from P and reaches C under gravitational attraction only. Its speed at C will be
Options :
√(2GM/a)
√((2GM/a)(1-1/√2))
√((2GM/a)(√2-1))
Zero
Answer :
√((2GM/a)(1-1/√2))
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