Question Number 180919 by anne1344 last updated on 19/Nov/22
Answered by Socracious last updated on 19/Nov/22
$$\:\:\:\:\:\:\:\:\:\mathrm{V}_{\mathrm{r}} \:=\sqrt{\left(\mathrm{4ms}^{−\mathrm{1}} \right)^{\mathrm{2}} +\left(\mathrm{7}.\mathrm{0ms}^{−\mathrm{1}} \right)^{\mathrm{2}} } \\ $$$$\:\:\:\:\:\:\:\:\:\:\:\:\:\:=\sqrt{\left(\mathrm{16}\right)+\left(\mathrm{49}\right)}\:\frac{\mathrm{m}}{\mathrm{s}} \\ $$$$\:\:\:\:\:\:\:\:\:\:\:\:=\sqrt{\mathrm{65}}\:\frac{\mathrm{m}}{\mathrm{s}} \\ $$