A boy 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

ОА. 55

ОВ. 20 Ј

Ос. 2.5J

Op. 10

Answer : 10 option D

10

Explanation:

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

W = k_f - K_i

in order to find work done we can say

W = F. d

here we have

F = 5 N

d = 2 m

so we have

W = (5) (2) J

W = 10 J

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

K = 10 J