Question

Define Kinetic Energy. Write expression for Kinetic 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:

Kinetic energy is an energy which a body possesses by virtue of being in motion.

Solution : Kinetic energy of an object, i.e., Ek=12mυ2 Where m = mass of the object and υ = uniform velocity of the object.

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

 

Explanation:

PLS MARK AS BRAINLIEST

Answer 2

Kinetic energy is a property of a moving object or particle and depends not only on its motion but also on its mass. The kind of motion may be translation (or motion along a path from one place to another), rotation about an axis, vibration, or any combination of motions

ke =1/2 mv^2. or. k.e = (force)^2 ×(time)^2 /mass

in ur case

F=12 N

M=4kg

T=3 s

so

ke. = (12)^2 ×(3)^2/4

=324 j ans

please mark it brainliest.