A body slides down a smooth slope at an angle whose sine is 4/5. What is its acceleration? (take g = 10 m/s²)
Answer and explanation
Correct answer: C. 8 m/s²
- Step 1: On a smooth slope a = g sin θ. Step 2. a = 10 × 4/5 = 8 m/s². Answer: 8 m/s². Why not the others: 6 m/s² is what you get if you use the cosine instead of the sine. 10 m/s² is what you get if you ignore the slope. 1.6 m/s² is what you get if you square the sine.
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