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Q. A toy train with 1.2kg mass is moving at a stright line platform with a velocity 12m/s. It collides another toy train of 0.9kg mass with velocity of 7m/s. If e = 0.8, what is the velocity of each train after the collision.

Q. You want to take a bath with the water temperature at 35.0°C. The water temperature is 38.0°C from the hot water tap and 11.0°C from the cold water tap. You fill the tub with a total of 185 kg of water. How many kilograms of water from the hot water tap do you use?

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