alleryA $2\,\text{kg}$ block hangs vertically by a string and remains at rest. Taking $g = 10\,\text{m s}^{-2}$, what is the tension in the string?
A$10\,\text{N}$
B$20\,\text{N}$
C$22\,\text{N}$
D$24\,\text{N}$
Answer & Solution
Correct answer: B. $20\,\text{N}$
If the block is at rest, acceleration is zero, so net force is zero.
**Therefore tension equals weight:** $T = mg = 2\times 10 = 20\,\text{N}$.
**Hence option B.**
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