A block of mass 4.0 kg rests on a horizontal surface where the coefficient of kinetic friction between the two is 0.20 . A string attached to the block is pulled horizontally, resulting in a 3.0-m/s2 acceleration by the block. Find the tension in the string. (g = 9.80 m/s2)
a. 12 N
b. 7.8 N
c. 20 N
d. 4.2 N
c
Physics & Space Science
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