A person jumps from a cart freely moving along a horizontal path with a speed v1=3 m/s in the direction opposite to the movement of the cart, after which the speed of the cart changed and became equal to u1=4 m/s. Determine the horizontal component of the speed u2x of a person when jumping relative to the cart. The mass of the trolley is m1=210 kg, the mass of the person is m2=70 kg.
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