Question

Name the physical quantity whose SI units are :
a) m/s^-1
b) m/s^-2​

Answer 1

a) Speed , Velocity

b) acceleration

Answer 2

There are no such quantities

If you think of a) as speed and b) as acceleration, let me tell you that the SI unit of speed is m/s or ms^-1 and not m/s^-1

Also... the SI unit of acceleration is m/s^2 or ms^-2 and not m/s^-2