What kinetic energy does a car weighing 2 tons, moving at a speed of 80 km / h, have?

univerkov | December 3, 2020 | education

Given:
m = 2 t
v = 80 km / h
Find: Eк
Decision:
Ek = mv ^ 2/2
2 tons are converted to SI
2 t = 2000 kg
Let’s convert 80 km / h to m / s
80 * 1000/3600 ≈ 22 m / s
Substitute the resulting values
Ek = 2000 * 22 ^ 2/2 = 484000 J

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