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A1 Field Crops Pest Management Practice Exam

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A drive-thru worker slides a 0.5 kg tray of food across a counter. The initial velocity is 3 m/s and it stops after 1.5 meters. What is the coefficient of kinetic friction? (g = 9.8 m/s²)
Correct Answer:
0.31
Explanation:
Work-energy: 0.5*m*v² = F_f * d = mu*m*g*d. 0.5*(3)² = mu*(9.8)*(1.5). 4.5 = 14.7*mu, mu ≈ 0.31.

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