如何获取box2d对象的当前移动速度

Ton*_*shi 3 box2d cocos2d-iphone

我对b2体施加了力量,但是想知道有没有办法知道在运用forceforce/applylinearimpulse之后b2体的速度是多少?

b2Body* car;
b2Vec2 force = b2Vec2(0,100);
car->ApplyForce(force, car->GetPosition());
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ren*_*ooi 8

b2Vec2 vel = body-> GetLinearVelocity();