If an object moving in a straight line with a mass of 50g has an initial velocity of 300km/hr and a force acts on it suddenly, changing the velocity

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If an object moving in a straight line with a mass of 50g has an initial velocity of 300km/hr and a force acts on it suddenly, changing the velocity to 230km/hr, what is the net work done on the system? (express answer in m/s)