Is it jut me or is there an error in this example?

[GingerKhan]

Where did the 50 for the v value come from?

 

[ehild]

It must be a typo.

ehild

 

[D H]

More likely the 12 m/s was a typo, since 50 as a typo also means that the 410 N (stated twice) were also typos.

 

[ehild]

More likely the 12 m/s was a typo, since 50 as a typo also means that the 410 N (stated twice) were also typos.

You are right, 12 was the typo

ehild