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 !!!
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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
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