Which of the following quantities is a velocity? a 25 m/s b 15 m/s2 c 3 g/L in weight d 10 km/hr eastward
Velocity is a vector quantity that refers to the rate at which an object changes its position. It is expressed as a speed (a scalar quantity) with a direction. Among the options you provided, the quantity with both a magnitude and a direction is:
d) 10 km/hr eastward
This specifies a speed of 10 kilometers per hour, as well as the direction of the motion, which is eastward. Therefore, this is a velocity.
Let's review the other options for clarity:
a) 25 m/s: This is a speed as it has no direction specified. It would be a velocity if a direction were given.
b) 15 m/s²: This is an acceleration, the rate of change of velocity, not a velocity itself.
c) 3 g/L in weight: This is a measure of density or concentration (specifically, 3 grams per liter), not a velocity. Also, note that "weight" is not an appropriate term in this context; mass would be more accurate.