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

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

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