A force of 20 N acts horizonally on a mass of 10 kgs being p
A force of 20 N acts horizonally on a mass of 10 kgs being pushed up a frictionless incline that makes a 30 angle with the horizontal,The magnitude of the acceleration of the mass up the incline is equal to?
难道这个力真的是向上的吗?我怎么觉得重力的分力大于推力,应该下滑啊