Two identical trucks move evenly along the highway. The first one at a speed of 72 km / h, and the second – 20 m / s. Which truck has the most kinetic energy?
m1 = m2.
V1 = 72 km / h = 20 m / s.
V2 = 20 m / s.
The kinetic energy of the body Ek is determined by the formula: Ek = m * V2 / 2, where m is the mass of the body that moves, V is the speed of movement.
Since the trucks are the same, their masses are equal to each other: m1 = m2.
Let’s translate the speed of the first truck V1 into SI units: V1 = 72 km / h = 72 * 1000 m / 1 * 60 * 60 s = 72000 m / 3600 s = 20 m / s.
Since their velocities V1 = V2 and masses m1 = m2 are the same, then their kinetic energy will also be the same Ek1 = Ek2.
Answer: the kinetic energy of trucks is the same Ek1 = Ek2.
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