Case a: a "happy ball" collides with the floor moving at 2 m/s and rebounds upward at 1 m/s.
case b: a "sad ball" with the same mass collides the floor moving at 2 m/s and stops.
the collision time is the same for each case.

which variable is different for these two cases?
which case involves the greatest momentum change? the greatest impulse? the greatest force?

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).

the aurora is formed when charged particles emitted from the sun during a solar flare penetrate the earth's magnetic shield and collide with atoms and molecules in our atmosphere. these collisions result in countless little bursts of light, called photons, which make up the aurora.

auroras are generated by charged solar particles hitting molecules in earth's atmosphere. this usually happens in high latitudes, because our planet’s magnetic field tends to funnel these particles toward the poles. that’s why it can be experienced in northern ohio.