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magnetism is different property than simple attraction,it is a characteristic property of som material like iron,the reason why som material show this property has 2 deal with the dipole moment of the dipole moment of atoms,if the atomic dipoles r arranged n such a way that it produces a net dipole moment of the material ,the substance has magnetic property.

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first o all u should make clear the situation,for example if the bodies only hav horizontal velocity & r projected simultaneously,they will nvr collide.now if they do hav som vertical component of velocity,it is easier 2 solve by considering the 2 components o velocity separately,after all for The bodies 2 collide they must hav the same x & y co-ordinates at the same point o time,GOT IT!

Q;When a body is weighed on an ordinary balance we demand that the arm should be horizontal if the weight on the 2 pans are equal.Suppose equal weight is now put on the 2 pans and the arm is not horizontal,it makes a angle with the horizontal.then even when the total torque should be zero ,why does the arm rotates and becomes horizontal?