JEE Mains · Physics · STD 11 - 5. work,energy,power and collision
A body of mass \(1\,kg\) collides head on elastically with a stationary body of mass \(3\,kg\). After collision, the smaller body reverses its direction of motion and moves with a speed of \(2\,m / s\). The initial speed of the smaller body before collision is \(..........ms ^{-1}\)
- A \(3\)
- B \(4\)
- C \(2\)
- D \(1\)
Answer & Solution
Correct Answer
(B) \(4\)
Step-by-step Solution
Detailed explanation
\(1 \times u _1=-2+3 v \Rightarrow u _1=-2+3 v\) \(1=\frac{ v +2}{ u _1} \Rightarrow v +2= u _1\) Solving \((1)\) and \((2)\) \(u _1=4\,m / s\)
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