Một chất điểm dao động điều hòa có đồ thị li độ theo thời gian như hình vẽ. Tốc độ của vật tại N là
A.\(15cm/s\)
B.\(16cm/s\)
C.\(20cm/s\)
D.\(30cm/s\)

Các câu hỏi liên quan

Quy đồng các phân thức \(\dfrac{{3{x^2} + 2x - 4}}{{{x^3} - 7x + 6}};\,\)\(\dfrac{{2x - 1}}{{{x^2} + x - 6}};\)\(\dfrac{3}{{x + 3}}\)
A.\(\dfrac{3x^2 + 2x - 4}{\left ( x + 3 \right )\left ( x - 2 \right )\left ( x - 1 \right )}\,;\,\,\dfrac{\left ( 2x - 1 \right )\left ( x - 1 \right )}{\left ( x + 3 \right )\left ( x - 2 \right )\left ( x - 1 \right )}\,;\,\,\dfrac{3\left ( x - 2 \right )\left ( x - 1 \right )}{\left ( x + 3 \right )\left ( x - 2 \right )\left ( x - 1 \right )}\)
B.\(\dfrac{3x^2 + 2x - 4}{\left ( x - 3 \right )\left ( x + 2 \right )\left ( x - 1 \right )}\,;\,\,\dfrac{\left ( 2x - 1 \right )\left ( x - 1 \right )}{\left ( x - 3 \right )\left ( x + 2 \right )\left ( x - 1 \right )}\,;\,\,\dfrac{3\left ( x + 2 \right )\left ( x - 1 \right )}{\left ( x - 3 \right )\left ( x + 2 \right )\left ( x - 1 \right )}\)
C.\(\dfrac{3x^2 + 2x - 4}{\left ( x - 3 \right )\left ( x + 2 \right )\left ( x + 1 \right )}\,;\,\,\dfrac{\left ( 2x - 1 \right )\left ( x + 1 \right )}{\left ( x - 3 \right )\left ( x + 2 \right )\left ( x + 1 \right )}\,;\,\,\dfrac{3\left ( x + 2 \right )\left ( x + 1 \right )}{\left ( x - 3 \right )\left ( x + 2 \right )\left ( x + 1 \right )}\)
D.\(\dfrac{3x^2 + 2x - 4}{\left ( x + 3 \right )\left ( x - 2 \right )\left ( x + 1 \right )}\,;\,\,\dfrac{\left ( 2x - 1 \right )\left ( x + 1 \right )}{\left ( x + 3 \right )\left ( x - 2 \right )\left ( x + 1 \right )}\,;\,\,\dfrac{3\left ( x - 2 \right )\left ( x + 1 \right )}{\left ( x + 3 \right )\left ( x - 2 \right )\left ( x + 1 \right )}\)