JEE Mains · Physics · STD 11 - 4.1 newtons laws of motion
A bullet of mass \(0.1\, kg\) is fired on a wooden block to pierce through it, but it stops after moving a distance of \(50\, cm\) into it. If the velocity of bullet before hitting the wood is \(10\) \(m / s\) and it slows down with uniform deceleration, then the magnitude of effective retarding force on the bullet is \('x' N.\) The value of \('x'\) to the nearest integer is................. \(N\)
- A \(7\)
- B \(8\)
- C \(10\)
- D \(12\)
Answer & Solution
Correct Answer
(C) \(10\)
Step-by-step Solution
Detailed explanation
\(v ^{2}= u ^{2}+2 as\) \(0=(10)^{2}+2(- a )\left(\frac{1}{2}\right)\) \(a =100 m / s ^{2}\) \(F = ma =(0.1)(100)=10\, N\)
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