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Q. Why the colligative properties of a solution more preferable to express the concentration in units of molality rather than molarity

Q. At t = 0, a particle leaves the origin with a velocity of 12 m/s in the positive x direction and moves in the xy plane with a constant acceleration of (-2.0i+4j) . At the instant the y coordinate of the particle is 18 m, illustrate what is the x coordinate of the particle?

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