5. A light and inextensible string support a body of mass of 15 kg hanging from its lower end. If the upper end of the string is firmly attached to a hook on the roof, then what is the tension in the string?
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Answer:147N
Explanation:As the body is not moving and just suspended, the tension in the string will be equal go the weight of the body. m = 15 kg
T = W = mg = 15 × 9.8 = 147 N
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