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**[SOLVED] Test tomorrow... trouble with conversion.**

Hi, I'm in Grade 11 Physics, and I have a Unit 1 Test tomorrow on motion and forces.

I'm not the smartest, so I can't exactly tell if the book is wrong. I'm doing a question out of the book, and was wondering what answers you guys come up with.

The question is: Calculate the net force acting on a 20kg object if the acceleration is:

a) 9.8m/s[tex]^{2}[/tex]

b) 0.28m/s[tex]^{2}[/tex]

c) 5669km/h[tex]^{2}[/tex]

d) (50km/h)/s

Currently, I'm stuck on c). The book says the answer is 8.8N, and I'm getting 3160N. The calculated a value I got was 158m/s[tex]^{2}[/tex].

If I'm wrong, can you tell me how to correct myself?

Thanks a lot for your help, guys.