A block of mass 2 kg lies on a horizontal surface in a truck. The coefficient of friction between the block and surface is 0.5. If the acceleration of the truck is 4 m/s2, then friction force acting on the block will be (g = 10 m/s2):
A. 10 N
B. 8 N
C. 6 N
D. Zero
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your answer is A, hope you can understand
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