The kinetic energy is high because, the mass of the object is large and thus has a great momentum and its velocity low because it has a large mass.
We know that kinetic energy of an object K = 1/2mv² where m = mass of the object and v = velocity of the object and its momentum, p = mv
For a given value of kinetic energy, the mass of the object m = 2K/v². This implies that m ∝ 1/v².
So, as the mass of the object increases, its velocity decreases.
So. an object with large mass has low velocity while an object with small mass has high velocity.
Also, the kinetic energy, K = 1/2mv². So, K ∝ mv². So, if m is large and v is small, the product mv² is large and thus K = 1/2mv² is high.
So, the kinetic energy of heavy vehicles is high because, the mass of the object is large and thus has a great momentum and its velocity low because it has a large mass.
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