The marker posts on a highway are 0.1 miles apart. If a truck is timed taking 5 seconds between posts, how fast is the truck going (in MPH; there are 3600 seconds in an hour)?

Which body is in equilibrium? (1) a satellite orbiting earth in a circular orbit (2) a ball falling freely toward the surface of earth (3) a car moving with a constant speed along a straight, level road (4) a projectile at the highest point in its trajectory

Ablock of mass m slides on a horizontal frictionless table with an initial speed v0 . it then compresses a spring of force constant k and is brought to rest. the acceleration of gravity is 9.8 m/s2 . how much is the spring compressed x from its natural length?

5. why should the electrons be placed separate from each other (why not together)?