[单选题]
A ball is tied to a
dt.fx-p4+hhai5k :hx ;+e*a (7uxbvwt/ 7a rl jskwg.$10\,cm$ rope and rotates in a horizontal circular path starting from point $X$ with a linear speed of $20\,cm\,s^{−1}$. The rope is cut after $2\,s$ when the object is moving at point $Y$ as shown in the diagram.
Which of the following is correct about the angular displacement of the ball between $X$ and $Y$ and the direction of motion of the ball after the rope is cut?
