38. A girl jogs around a horizontal circle with a constant speed. She travels one fourth of a revolution, a distance of 25 m along the circumference of the circle, in 5.0 s . The magnitude of her acceleration is: A. \( 0.31 \mathrm{~m} / \mathrm{s}^{2} \) B. \( 1.3 \mathrm{~m} / \mathrm{s}^{2} \) C. \( 1.6 \mathrm{~m} / \mathrm{s}^{2} \) D. \( 3.9 \mathrm{~m} / \mathrm{s}^{2} \) E. \( 6.3 \mathrm{~m} / \mathrm{s}^{2} \) ans: C
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Since the girl travels one fourth of the circle's circumference, and this distance is 25 m, the full circumference \( C \) is: \[ C = 4 \times 25 \, \text{m} = 100 \, \text{m} \] Show more…
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A girl jogs around a horizontal circle with a constant speed. She travels one fourth of a revolution, a distance of 25 m along the circumference of the circle, in 5.0 s. What is the magnitude of her acceleration?
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