If an arm is stretched forward under water resistance is increased and a reaction force back ward is developed both of which would contribute to negative acceleration.
如果手臂在水中是向前伸展则阻力会随之增加而向后方的反作用力也会出现，二者都会产生负加速度。
2
This holds that the increased resistance to further acceleration is due to an increase in the object's mass.
这就是，认为进一步加速所增加的阻力来源于物体质量的增加。
3
This is again mainly due to the decrease of the equivalent moment of turning resistance with the increase of lateral acceleration.