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An object and a concave mirror of focal length f=10cm both move along the principle axis of the mirror at constant speeds. /the object moves with speed v0=15cm/s towards the mirror with respect to a laboratory frame. The distance between the object and the mirror at a given moment is denoted by u. When u=30cm the speed of the mirror v(m) is such that the image is instantaneously at rest with respect to the laboratory frame, and the object forms a real image. The magnitude of v(m) is ________cm/s.

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