Which of the following confirms that gravitational mass and inertial mass are equivalent?

a. free-fall acceleration is the same throughout the universe.
b. free-fall acceleration is the same at all points where the gravitational field strength is the same.

c. newton’s second law is valid throughout the universe.
d. an object’s weight can change with location, but the object’s mass remains constant.

Acar moves a distance of 50.0 km west, followed by a distance of 64.9 km north what was the magnitude of the displacement of the car, in units of kilometers?

Amoving electron has kinetic energy k1. after a net amount of work w has been done on it, the electron is moving one-quarter as fast in the opposite direction. (a) find w in terms of k1. (b) does your answer depend on the final direction of the electron's motion?

Aboat radioed a distress call to a coast guard station. at the time of the call, a vector a from the station to the boat had a magnitude of 45.0 km and was directed 15.0° east of north. a vector from the station to the point where the boat was later found is = 30.0 km, 15.0° north of east. what are the components of the vector from the point where the distress call was made to point where the boat was found? in other words, what are the components of vector c = b - a?