A 10 kg block is pushed with a constant horizontal force of 20 N against a constant horizontal frictional force of 10 N. What is the acceleration of the block?
1. 2 m/s2
2.5 m/s2
3. Zero
4. None of these
5. 1 m/s2
6. 10 m/s2
7. Insufficient information is provided.

Aparticle moves in the xy plane with constant acceleration. at time zero, the particle is at x = 6 m, y = 8.5 m, and has velocity ~vo = (9 m/s) ˆı + (−2.5 m/s) ˆ . the acceleration is given by ~a = (4.5 m/s 2 ) ˆı + (3 m/s 2 ) ˆ . what is the x component of velocity after 3.5 s? answer in units of m/s.