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Two hypothetical planets of masses m(1) ...

Two hypothetical planets of masses `m_(1) and m_(2)` are at rest when they are infinite distance apart. Because of the gravitational force they move towards each other along the line joining their centres. What is their speed when their separation is 'd' ?
(speed of `m_(1) ` is `v_(1)` and that of `m_(2)` is `v_(2)`)
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