1.

Two cars are moving with a velocity of 36 km hr and 54 km hr on a highway what is the ratio if the mass of car is 400 kg and 600 kg respectively

Answer»

We can get their ratio by getting their RESPECTIVE kinetic ENERGIES.


Kinetic energy = 0.5mv²


V should be in meters PER second.


Car A :


V = 36 × 5/18 = 10m/s


KE = 0.5 × 10² × 400 = 20000joules


Car B:


V= 54 × 5/18 = 15m/s


KE = 0.5 × 15² × 600 = 67500 joules


The ratio of A to B is


8 : 27



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