Question

1. which of the following is the correct si unit for velocity? meters per second seconds per meter meters per hour kilometers per hour

Explanation:

Velocity is defined as the rate of change of displacement. The SI unit of displacement is meters (m) and the SI unit of time is seconds (s). So, the SI unit of velocity is meters per second ($m/s$). Seconds per meter is a unit of the reciprocal of velocity. Meters per hour and kilometers per hour are units of velocity but not the SI units. The SI unit is based on the fundamental SI units of length (meter) and time (second).

Answer:

meters per second