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Ethan, whose mass is 80 kg, stands at one end of a very long, stationary wheeled...

Ethan, whose mass is 80 kg, stands at one end of a very long, stationary wheeled cart that has a mass of 500 kg. He then starts sprinting toward the other end of the cart. He soon reaches his top speed of 8.0 m/s, measured relative to the cart.

What is the cart’s speed when Ethan reaches top speed?

Express your answer with the appropriate units.

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