Final answer:
The tension in the string is equal to the weight of the block, which can be calculated by multiplying the mass of the block by the acceleration due to gravity.
Step-by-step explanation:
The tension in the string can be found by considering the forces acting on the block. In this case, the weight of the block acts downwards and is balanced by the tension in the string pulling upwards. Since the block is at rest, the tension in the string must be equal to the weight of the block.
Therefore, the tension in the string is equal to the weight of the block, which is given as 6 kg. Using the equation Tension = Mass x Gravity, where the mass is 6 kg and gravity is approximately 9.8 m/s2, we find that the tension in the string is approximately 58.8 N.