A 10 kg object is moving to the right at 6 m/s and collides with another object with an unknown mass moving to the left at 10 m/s. The objects collide and stick together. After the collision, the combined object?

has less kinetic energy than the system had before the collision.

is moving to the right.

is moving to the left.

is at rest.

The direction of the current in an alternating current circuit remains constant. is direct. changes repeatedly. changes randomly.

This is a form of winter precipitation. it is frozen precipitation falling as ice pellets. snowflakes melt into raindrops as they pass through a thin layer of warmer air. the raindrops then refreeze into particles of ice when they fall into a layer of sub-freezing air near the surface of the earth. this precipitation is called a) hail. b) rain. c) sleet. d) snow.

While preforming an experiment involving a reaction between two chemicals the scientist observes that the reaction container has become warm the observation is an example of