Question

A 6.0 N horizontal force is applied to a flat rock on a frictional frozen pond. causing it to accelerate at $2.0m/s^2$. What is the mass of the rock?

• A. 12 kg
• B. 0.33 kg
• C. 3.0 kg
• D. 60 kg
• E. 20 kg

Answer 1

Answer: (C)

3.0 kg

Horizontal force $F=6.0$ N

Acceleration of the rock $a=2.0m/s^2$

Thus mass of the rock $m=\frac{F}{a}=\frac{6.0}{2.0}=3.0$ kg