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【单选题】
一个质量为2kg的物体，在六个恒定的共点力作用下处于平衡状态．现同时撤去大小分别为15N和20N的两个力而其余力保持不变，关于此后该物体运动的说法中正确的是（）
A.
一定做匀变速直线运动，加速度大小可能是5m/s 2
B.
一定做匀变速运动，加速度大小可能是15m/s 2
C.
可能做匀减速直线运动，加速度大小是2m/s 2
D.
可能做匀速圆周运动，向心加速度大小可能是5m/s 2
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