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A particle with mass m=1 kg is thrown vertically upward in a constant gravitational field with...

A particle with mass m=1 kg is thrown vertically upward in a constant gravitational field with an initial speed of v0=8 m/s. There is a retarding force F = - k m v2 acting on the particle where v is the instantaneous speed and k=1.5 (in SI units). The speed of the particle when it returns to the initial position is

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