Question

which row defines speed and velocity?
a distance travelled in a given direction speed per unit time
b distance travelled per unit time speed in a given direction
c distance travelled in a given direction speed in a given direction
d distance travelled per unit time speed per unit time
a
b
c
d

Explanation:

Speed is a scalar quantity, defined as the distance travelled per unit time. Velocity is a vector quantity, which is speed in a given direction.

Answer:

B. distance travelled per unit time, speed in a given direction