nt/courseuserassignments/view?coursel Answer in units of m/s. 019 (part 1 of 2) 10.0 points (The normal force is perpendicular to the sup- porting surface.) ? m.g The magnitude of the normal force on a block sliding down to a friction-free inclined plane 1. is greater than mg, always. 2. may be greater than mg. 3. is less than mg, always. 4. is equal to mg. 020 (part 2 of 2) 10.0 points NT In The magnitude of th its su