Question

An object of mass m and velocity v has kinetic energy =200J.Find the new kinetic energy if the mass of the object becomes double and the velocity still remains the same
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Answer 1

Answer:

let the k.e. in first case be x

x = 1/2*m*v^2=200j

in second case

let the kinetic energy be x'

v'=v

m'=2m

x'= 1/2*2m*v^2

x'= 2(1/2*m*v^2)

x'=2(x)

x'=2*200j

x'=400j

Explanation:

Answer 2

Answer:

400J

mass =m

velocity=v

Kinetic energy = K.E=200J

K.E=1/2 mv square

K.E =200 J

mass becomes twice then,

m' = 2m ( 2 new masses)

K.E'= New Kinetic energy

K.E =1/2 mv square(2)

Put value of K.E or 1

we get,

K.E=K.E×2

K.E = 200×2

K.E= 400J