A person walks a distance of 3.0 km due south and then a distance of 2.0 km due east.
If the walk lasts for 3.0 h find
(a) the average speed for the motion;
(b) the average velocity.

The friction of the water on a boat produces an acceleration of -10. m/s2. if the boat is traveling at 30. m/s and the motor is shut off, how long it take the boat to slow down to 5.0 m/s?

An element becomes a positively charged ion when itloses protons. loses electrons. gains electrons. gains neutrons.

What is the relationship between globular clusters and the milky way?