This is called average speed.Its really simple
Okay... so here's what happened;
A huge amount of mass is above you, squeezing down from you from all sides; that's what happened to the hydrogen gas in the core of the sun. It got squeezed together so tightly that four hydrogen nuclei combined to form one helium atom. That's called nuclear fusion. In the process, some of the mass of the hydrogen atoms is converted into energy in the form of light.
:)
The given figure shows the arrangement of vectors
-B is acting with a magnitude of 25 with 
So vector B is along the opposite direction of vector -B
Statement A is wrong since the direction is opposite
Statement B is also wrong since it makes 
Statement C is correct since it has 25 m magnitude
Statement D is wrong because vector's magnitude cannot be negative.
So option C is the correct answer.
The 2 roles of forensic engineers is the detective role and then the engineering role.