Aboy slides a book across the floor, using a force of 5 n over a distance of 2 m. what is the kinetic energy of the book after he slides it? assume there is no friction.
a. 20 j
b. 10 j
c. 5 j
d. 2.5 j

As we know from work energy theorem that work done by external force is change in kinetic energy

So from all above we can say

in order to find work done we can say

here we have

so we will have

so from above equation we can say that final kinetic energy will be same as work done

so we will have kinetic energy as

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.