$A$ system of $N$ particles is free from any external forces. Which of the following is true for the magnitude of the total momentum of the system?
$A$ system of $N$ particles is free from any external forces. Which of the following is true for the magnitude of the total momentum of the system?
- A
It must be zero
- B
It could be non-zero, but it must be constant
- C
It could be non-zero, and it might not be constant
- D
The answer depends on the nature of the internal forces in the system
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- [JEE MAIN 2020]
A mass of $100\,g$ strikes the wall with speed $5\,m/s$ at an angle as shown in figure and it rebounds with the same speed. If the contact time is $2 \times {10^{ - 3}}\,\sec $, what is the force applied on the mass by the wall
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- [NEET 2022]