A metal rod of 20m length has an isosceles triangle base where the equal sides are 12cm each if the included angle in the base is 40° , calculate a) The area of the cross section. b). The volume of the metal rod. c) The mass of the metal rod if it is made of copper whose density is 9000kg/m^3

The man of mass m1 and the woman of mass m2 are standing on opposite ends of the platform of mass m0 which moves with negligible friction and is initially at rest with s = 0. the man and woman begin to approach each other. derive an expression for the displacement s of the platform when the two meet in terms of the displacement x1 of the man relative to the platform.