A cylindrical disc of mass 0.24 kg has a circular cross-sectional area A, as shown in Fig. 3.1. [Figure 3.1 and Figure 3.2] The disc is on horizontal ground, as shown in Fig. 3.2. A force X of magnitude 8.9 N acts on the disc in a direction of 30° to the horizontal. The disc moves at a constant speed of 0.60 m s⁻¹ along the ground.
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