NTA Abhyas 2020
- Exam
- NTA Abhyas
- Year
- 2020
- Subject
- Physics
- Chapter
- Motion in One Dimension
NTA Abhyas 2020 · Physics · Motion in One Dimension
A target is made of two plates, one of wood and the other of iron....
A target is made of two plates, one of wood and the other of iron. The thickness of the wooden plate is cm and that of the iron plate is cm. A bullet fired goes through the wood first and then penetrates cm into iron. A similar bullet fired with the same velocity from the opposite direction goes through iron first and then penetrates cm into the wood. If and be the retardation offered to the bullet by wood and iron plates respectively, then
Options
- A
- B
- C
- DData insufficient
Correct answer
B.
Step-by-step solution
Let {a}_{2}A \to B \to C,{v}_{1}^{2} - u^{2} = 2{a}_{1} and
Adding, we get
...(i)
For A^{′} \to B^{′} \to C^{′},
and
Adding, we get
....(ii)
Equating Eqs. (i) and (ii) and solving, we get
Adding, we get
...(i)
For A^{′} \to B^{′} \to C^{′},
and
Adding, we get
....(ii)
Equating Eqs. (i) and (ii) and solving, we get