As shown in the figure, the length of the uniform thin straight bar AB is l, the mass is m, and the instantaneous velocity of point a is V, then the momentum of the bar AB is? What about kinetic energy?

As shown in the figure, the length of the uniform thin straight bar AB is l, the mass is m, and the instantaneous velocity of point a is V, then the momentum of the bar AB is? What about kinetic energy?

Let the midpoint of AB be o, because AB is homogeneous, so o is the center of mass of ab. 1) Ao = AB / 2, according to the mathematical model, we can infer that the vertical downward velocity of O is v / 2. 2) because the angle between AB and the ground is 45 degrees, we can know that B has a right movement trend, the instantaneous velocity of B is the same as that of a, the size is V, and the direction is horizontal to the right