robert7248
contestada

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.

A. 20 J
B. 10 J
C. 5 J
D. 2.5 J

Respuesta :

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

[tex]W = k_f - K_i[/tex]

in order to find work done we can say

[tex]W = F.d[/tex]

here we have

[tex]F = 5 N[/tex]

[tex]d = 2 m[/tex]

so we will have

[tex]W = (5)(2) J[/tex]

[tex]W = 10 J[/tex]

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

so we will have kinetic energy as

[tex]K = 10 J[/tex]

Otras preguntas