Task id8890
A cart of mass M stands on a smooth horizontal plane (Fig.). A mathematical pendulum of mass m and length l is mounted on a cart. At the initial moment, the cart and the pendulum had a speed equal to zero, and the pendulum thread formed an angle α with the vertical. Find the speed of the cart at the moment when the pendulum passes through the vertical position. (The wheels of the cart are considered to have no mass.)
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