Answer :
Final answer:
The SI unit for velocity is metre per second (m/s), which represents the displacement of an object per unit time. Acceleration has the unit metres per second squared (m/s²), which shows the change in velocity per second. Velocity is a vector with both magnitude and direction. The correct answer is option B.
Explanation:
The student is asking about the SI (International System of Units) unit of velocity. The SI unit for velocity is the metre per second (m/s), not metre per second squared (m/s2). Acceleration, however, which is the rate of change of velocity, does have the units of metres per second squared (m/s2) or metres per second per second. This unit indicates how many metres per second the velocity of an object increases every second.
Velocity is a vector quantity, meaning it has both magnitude and direction. When calculating velocity, you divide the displacement (distance in a specific direction) by the time it takes to travel that distance. Velocity can be expressed in various units like kilometres per hour (km/h) or micrometers per nanosecond (μm/ns), but the standard SI unit is metre per second.
