Two billiard balls of equal mass move at right angles and meet at the origin of an xy coordinate system. Ball A is moving upward along the y axis at v_A = 2.0m/s , and ball B is moving to the right along the x axis with speed v_B = 5.0m/s . After the collision, assumed elastic...
Potential energy = 30 J, Spring stiffness constant k = 420 N/m distance x = ? Potential energy = 1/2*k*x^2 => 30 = 1/2*420*x^2 => x = √(30/210) = 0.378 m