Question

A car is running at a speed of 15km/h while another similar car is moving at a speed of 45km/h .find the ratio of their kinetic energies.
plzz answer this one fast !!!​

Answer 1

Answer:

1:9

Step-by-step explanation:

we know that K.E=1/2mv^2

K.E1=1/2mv1^2

=1/2m1(15)^2 =>1

K.E=1/2mv2^2

=1/2m2(45)^2 =>2

K.E1/K.E2=1/2m(15)^2÷1/2m(45)^2

as cars are similar(m1=m2)

=15×15÷45×45

=1×1÷3×3

=1/9

no units as similar quantiries are divided

so ratio of K.E1÷K.E2=1/9