If was watching national geographic about comets?

Question

they said that the comet that wiped out the dinosaurs was 10 km long and had speed 30km/s and made about 200 km crater, and the comets that hit jupiter 1993 every one were about 1,6 km and were traveling 224000 km/h and every one made a scar the size of our earth and they could be seen for a year, does that mean that speed can create much greater force that size?

Answer 1

Yes, that is correct.  

The kinetic energy formula is Energy = mass x (velocity squared)

That means that if you double the speed, the impact energy is 4 times.

If you triple the speed, the energy is 9 times.

etc etc

There is another factor with Jupiter is that it is a gas planet, so the scars would be bigger in any case.

But you are quite correct in your assumption.

Answer 2

Well, speed is definitely a factor.... think of it this way - a car that rolls into you at 4 miles per hour hurts a lot less than the same car moving 40 mph.  Likewise, a brick, if dropped on your foot from 2 feet above will cause less damage than a brick 1/2 it's size when dropped from 50 feet.

It's called kinetic energy; the formula is E(k) = 1/2 M(V**2)

So, kinetic energy = 1/2 mass times the velocity, squared.  Note that it's the *square* of velocity, which means that as speed goes up, the the amount of energy the object has rises faster.

And, when an object moving *very* fast hits something else, that energy is transferred (usually destructively) to both objects....