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Q. Suppose you wish to lean a 3.00 m ladder against a smooth, vertical wall. The ladder's center of gravity is 2/3 of length from the top. If the coefficient of static friction between the ladder and the floor is 0.60, what is the largest angle ladder can make with the wall before it begins to slip?

Q. A 10.00 g object moving to the right at 21cm/s makes an elastic head-on collision with a 15g object moving in the opposite direction at 32.0 cm/s. Find out the velocity of each object after the collision.

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