This should help look at the pictures?
You use more significant figures. 5 sigfigs (1.0985) is more accurate than 2 sigfigs (1.0)
<span>A van is traveling on a road at a speed of 55 km/h relative to a
stationary observer on the side of the road. A girl sitting near the
driver of the van throws a paper airplane to a boy at the back of the
van with a speed of 2 km/h relative to the girl, the boy, and the van.
The speed of the paper airplane, relative to the same stationary observer
on the side of the road, is (55 - 2) = 53 km/h. No rounding is necessary.</span>
I believe Intermolecular forces hold, <span>molecules, ions, and atoms? But I would see if that doesn't sound familiar check it with a site or something?</span>
According to KE = (3/2)kT
reducing temperature, in KELVIN, by half, average KE is reduced by half.