A Box (M = 20 Kg)is Sitting on a Horizontal

question 39

Multiple Choice

A box (M = 20 kg) is sitting on a horizontal surface.It is connected to a massless hook by a light string passing over a massless pulley wheel.The coefficients of friction between the box and the surface are 0.80 (static) and 0.30 (kinetic) .If 15 kg (in total) are placed on the hook,calculate the acceleration of the box.

• A)10 m/s
• B)4.4 m/s
• C)2.5 m/s
• D)12 m/s
• E)0

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