AP EAMCET · PHYSICS · Laws of Motion
A block of metal 4 kg is in rest on a frictionless surface. It was targeted by a jet releasing water of \(2 \mathrm{~kg} \mathrm{~s}^{-1}\) at a speed of \(10 \mathrm{~ms}^{-1}\). The acceleration of the block is
- A \(10 \mathrm{~ms}^{-2}\)
- B \(15 \mathrm{~ms}^{-2}\)
- C \(20 \mathrm{~ms}^{-2}\)
- D \(5 \mathrm{~ms}^{-2}\)
Answer & Solution
Correct Answer
(D) \(5 \mathrm{~ms}^{-2}\)
Step-by-step Solution
Detailed explanation
\(\mathrm{v}=10 \mathrm{~m} / \mathrm{s}, \frac{\mathrm{dm}}{\mathrm{dt}}=2 \mathrm{~kg} / \mathrm{s}\) \(\therefore \quad\) Force applied by jet on the block is \(\mathrm{F}=\mathrm{v} \cdot\left(\frac{\mathrm{dm}}{\mathrm{dt}}\right)=10 \times 2=20 \mathrm{~N}\)…
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