An ice hockey puck with a mass of 0.19 kg collides inelastically with a 0.85 kg snowball that is sliding to the left with a speed of 0.70 m/s. The combined puck and snowball slide along the ice with a velocity of 4.2 m/s to the right. What is the velocity of the hockey puck before the collision?

answer: 31, 5556. 952 seconds

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.

the doppler effect is used by weather forecasters to measure 

moving clouds