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5. A star of mass 2×10³⁰kg moving with a velocity of 2 × 10¹ m/s [E]collides with a second star of mass 5 × 1030 kg moving with a velocity of 3 × 10 m/s at a right angle to the path of the first star. If the two join together, what is the magnitude of common velocity?

Fig: 1

Fig: 2