JEE Mains · Physics · STD 11 - 4.1 newtons laws of motion
A block of metal weighing \(2 \,kg\) is resting on a frictionless plane (as shown in figure). It is struck by a jet releasing water at a rate of \(1 \,kgs ^{-1}\) and at a speed of \(10 \,ms ^{-1}\). Then, the initial acceleration of the block, in \(ms ^{-2}\), will be .................
- A \(3\)
- B \(6\)
- C \(5\)
- D \(4\)
Answer & Solution
Correct Answer
(C) \(5\)
Step-by-step Solution
Detailed explanation
\(F =\frac{ dp }{ dt }= v \frac{ dm }{ dt }\) \(\Rightarrow Ma =10 \times 1\) \(\Rightarrow 2 a =10\) \(a =5 \,m / sec ^{2}\)
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