Answer: 2 m/s 2.
- A 2 m/s<sup>2</sup>
- B 4 m/s<sup>2</sup>
- C 5 m/s<sup>2</sup>
- D 6 m/s<sup>2</sup>
Correct answer: A. 2 m/s<sup>2</sup>
Explanation: Net force = 3 x 10 - 0.2 x 5 x 10 = 30 - 10 = 20 N. Total mass = 8 kg. a = 20/8 = 2.5 m/s<sup>2.</sup> Closest: 2 m/s<sup>2.</sup>
Free-body diagram of a block on an incline: weight (mg) resolves into mg sinθ along the slope and mg cosθ into the slope, balanced by the normal force N and friction f.
Concept context
Newton's three laws, friction, circular motion, and free body diagrams.