Question

Energy.A force of 12N acts on an

object of mass of 4kg in the state of rest for 3s. Calculate the kinetic energy acquired by the

object.​

Answer 1

Answer:

For a block in equilibrium,

Equating forces along Y−axis,

Normal reaction, N=mg

Equating forces along X−axis,

ma=F−f

where f=μmg

ma=F−μmg

a=

m

F−μmg

a=

4

12−0.2×4×10

a=

4

12−8

a=

4

4

a=1 ms

−2

solution