A20 kg block slides to the left along a horizontal frictionless surface and hits an uncompressed spring of spring constant 810 n/m, which sends the mass back to the right with the same speed. for how long is the block in contact with the spring? a) 0.785 s b) 0.641 s c) 0.597 s d) 0.555 s e) 0.494 s

gravity

explanation:

i don't understand. explain it clearly

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.