If the slider along the smoth guide (i.e., no friction) on the horisontal plane has the speed 1.4m/s at A, what force F will the guide exert on the slider at point B? The weight of the slide is 0.12kg http://img522.imageshack.us/img522/750/slider4lo.png I'm able to calculate F at A = mg = 1.177. And the answer at B is different so I guess the speed should be different (but this is strange since it doesn't say anything about an acceleration in the tangential direction). But how do I get the speed at B? Thank you.