JEE Mains · Physics · STD 11 - 1. units,dimensions and measurement
A body of mass \((5 \pm 0.5) kg\) is moving with a velocity of \((20 \pm 0.4) m / s\). Its kinetic energy will be
- A \((1000 \pm 140)\,J\)
- B \((1000 \pm 0.14)\,J\)
- C \((500 \pm 0.14)\,J\)
- D \((500 \pm 140)\,J\)
Answer & Solution
Correct Answer
(A) \((1000 \pm 140)\,J\)
Step-by-step Solution
Detailed explanation
\(k =\frac{1}{2} mv ^2\) \(k =\frac{1}{2} \times 5 \times 400=5 \times 200=1000\,J\) \(\frac{\Delta k }{2 k }=\frac{\Delta m }{ m }+\frac{2 \Delta v }{ v }=\frac{0.5}{5}+\frac{2 \times 0.4}{20}\)…
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