Ball A is released from rest at height 85m at the same time that a second ball B is thrown upward from a distance 2m above the ground. If the balls pass one another at a height 25m.(a) Determine the speed at which ballB was thrown upward. (b) Determine the speed of ball Bwhen the balls pass one another (c) Determine the total time of travel when the balls pass one another. acceleration due to gravity = 9.81m/s2

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Friction

Friction is defined as the force that prevents any solid surface, any layer of fluid, or any kind of element or material from sliding.