A car is running at a
speed 12 km/h while another
similar car is moving at a
speed 36 km/h .What is the
ratio of their kinetic energy
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Explanation:
It is like one car is moving with v speed and other with 2v speed because one is 15 km/h and other is 30 km/h .
K.E=0.5×m×v2
K.E(1st)=0.5×m×v2
K.E(2nd)=0.5×m×(2v)2
Hence the ratio is 0.5×m×v2:0.5×m×(2v)2=1:4
Hence the ratio is 1:4.
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