How much force do you feel when you are riding in a rollercoaster vs. when two football players crash together at full speed?

Determine the fraction of the magnitude of kinetic energy lost by a neutron (m1 = 1.01 u) when it collides head-on and elastically with a target particle at rest which is 21h (heavy hydrogen, m = 2.01 u).

The material that keeps its new shape after it is stretched is called?

Name three populations commonly found in a prairie system