Which of the following quantities is a velocity? a 25 m/s b 15 m/s2 c 10 km/hr eastward d 3 g/L in weight
The correct answer is a) 25 m/s.
Velocity is defined as the rate of change of position of an object, and it is a vector quantity that has both magnitude and direction. Option a) 25 m/s represents a velocity because it has a magnitude of 25 m/s and indicates the speed and direction of the object.
Option b) 15 m/s^2 represents acceleration, which is the rate of change of velocity, not velocity itself.
Option c) 10 km/hr eastward represents speed, but it does not specify a change in position over time, so it does not represent velocity.
Option d) 3 g/L in weight is not a measure of velocity. It represents weight density, which is a measure of mass per unit volume, not the rate of change of position.