What is the magnitude of the force needed to keep a 60. -kg rubber block moving across level, dry concrete in a straight line at a constant speed of 3. 0 meters per second?.

It depends on the subject for me. some exams are easier than others so i usually go through it and answer questions i know based on my general knowledge, then double check after. going through the lesson can a lot  because the exams can be  very lesson-specific, but sometimes they are ridiculously long so a lot of people don't take the time. i did find that, when i went through the lessons, i was making 100's on my exams vs strictly using + the internet and  i make 90's. 

Iwould tell u but its against rules

The answer should be d if i’m wrong i’ll change my answer and fix it for you