Figure 1
Speed is a scalar quantity, It has only magnitude but no direction. It is defined as rate of change of <em>distance</em>.
Mathematically, speed = distance÷time
S = d ÷ t
S = 2560 ÷ 60
S = 42.67 m/s.
Bits:
Speed is a<em> scalar </em>quantity, that describes only the <em>magnitude (42.67 m/s) </em>of the rate of change of an objects <em>distance. </em>Determine the objects speed requires a unit of <u><em> distance </em></u>per unit of <u><em>time</em></u>
Figure 2
Velocity is a vector quantity, It has both magnitude and direction. It is defined as rate of change of <em>displacement.</em>
<em>Mathematically, Velocity = Displacement </em>÷ time
V = 75 ÷ 1.5
V = 50 Km/h.
Velocity is a <em><u>Vector quantity </u></em>that describes both the<em><u> magnitude</u></em> and <em><u>direction of </u></em>the rate of change of objects <em><u>displacement </u></em> plus it describes its <u><em>position</em></u>. An objects overall change in position is known as <em><u>its Displacement per unit time.</u></em>