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【简答题】
一个质量为m的质点在OXY平面上运动，其位置矢量为r=acosωti+bsinωtj（SI），式中a、b和ω是正值常量，且a＞b。（1）求质点在点C（a，0）点D（0，b）时的动能；（2）求质点所受的合外力F以及当质点从点C运动到点D的过程中F的分力Fx和Fy分别做的功。
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