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A $2\,\text{kg}$ mass hangs from a string. Taking $g = 10\,\text{m s}^{-2}$, which statement is correct if the tension is $24\,\text{N}$?
AThe mass is moving downward with constant speed
BThe mass is accelerating upward
CThe mass is at rest
DThe mass is accelerating downward
Answer & Solution
Correct answer: B. The mass is accelerating upward
The weight is $mg = 2\times 10 = 20\,\text{N}$. Since tension $24\,\text{N}$ is greater than weight, the net force is upward, so the mass accelerates upward. Therefore option B is correct.