Why is my teacher calling 2m+(50s)(0.5m/s) pure piffle?

[thereidisanceman]

2m+(50s)(0.5m/s)
=
2m + 25m/{s}^{2}
=
Not possible

My teacher keeps saying this is pure piffle and shaking his head. Can someone please explain this to me?

 

[MarkFL]

We have:

$$2\text{ m}+\left(50\text{ s}\right)\left(0.5\,\frac{\text{m}}{\text{s}}\right)=$$

$$2\text{ m}+25\left(\cancel{\text{s}}\cdot\frac{\text{m}}{\cancel{\text{s}}}\right)=$$

$$(2+25)\text{ m}=27\text{ m}$$

 

[thereidisanceman]

oh... haha thank you!