Question

two objects having equal masses are moving with uniform velocity of 2 metre per second hand 6 metre per second respectively. calculate the ratio of their Kinetic energies?

Answer 1

K. E. of object1 = 1/2mv^2 = 1/2m*2*2 = 2m
K. E. of object2 = 1/2mv^2 = 1/2m*6*6 = 18m
So,
Ratio = 2m/18m = 1:9 Ans

Answer 2

Find The Kinetic Energy of First body
K1= 1/2 m(2)²=2m

The Kinetic energy of Second body
K2=1/2m(6)²=18m

[ Here m1=m2=m ]

Now Ratio of Kinetic energies = 2m : 18m

=1:9

Ratio of their Kinetic energies is 1:9