Which of the following are appropriate acceleration units? km/hr2 m/s/s ft/s miles/hr/min sec/km/m

Km/h² or m/s/s are the appropriate units of the acceleration.

Acceleration is the rate change of velocity of an object. it is given by

a=ΔV/Δt

Δv = change in speed

Δt = time taken

Δv is measured in meter of km

Time is measured in second s or hour h

so the units of acceleration are km/h² or m/s/s

I think it is m/s/s or miles/hr/min