The correct choice is :
The final momentum of the bullet/block is equal to the initial momentum of the bullet.
initially the block was at rest , hence
initial momentum of the block = 0
so total initial momentum was simply equal to initial momentum of bullet only.
after collision , the bullet gets embedded in the block , and hence both block-bullet move together at common velocity . according to conservation of momentum , momentum remains conserved in any type of collision.
so final momentum of bullet-block system = initial momentum of bullet
The second one is hope this helps
A rigid body is one for which all the parts maintain the same positions relative to one another. I cannot deform or change shape in any way. It can only translate and rotate. It is an idealization. There is no such thing as a perfectly rigid body.
A deformable body is one that can distort. It would normally refer to a solid object so that as it deforms, it sort of deforms in a way that it could return to its starting shape if all the external forces were removed that caused it to deform. I don’t think of a blob liquid as being a deformable body even though a liquid can clearly deform. An object made of rubber is the idea that I have in mind for a deformable body.
Smoother because it will increase energy and when the energy increases it’ll create heat also . Example: A car racing on a smooth road it’ll go faster than a Car speeding on a bumpy and rough road , Hope that helps .
Answer
In the parallel circuit, you have to position the switch on only one of the loops.