Aball has a speed of 15 m/s. only one external force acts on the ball. after this force acts, the speed of the ball is 7 m/s. has the force done positive, zero, or negative work on the ball?

Negative work

Explanation:

The work-energy theorem states that the work of the resultant forces acting on a particle modifies its kinetic energy:

Since the mass of the ball has to be positive, the work is negative.

i cant see the choices man

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.