If 0.5 i +0.8J+ ck is a unit vector. Then c is

|a+b+c|=1

√0.5²+0.8²+c²=1

squaring both sides  

0.5²+0.8²+c²=1

0.25+0.64+c²=1

c²+0.89=1.00

c²=0.11

c=√0.11

Explanation:

the electric field is a “force field” around a charged object that illustrates the direction the electric force would push an imaginary 

firearm identification is the process of analyzing the bullets and cartridge cases left at a crime scene to determine if they came from a particular firearm. marks on the bullets and cartridges may be common to every firearm of that type. these are called class characteristics.