# Vector uses in physics – Calculate velocity and acceleration – Exercise 3852

Exercise

A particle moves according to the law of motion

$$\vec{r}(t)=R\cos(\omega t)\vec{i}+R\sin(\omega t)\vec{j}$$

Where

$$\omega>0, R>0$$

Calculate the velocity function, the acceleration function, their values (vector sizes) and unit vectors.

$$\vec{v}(t)=-R\omega\sin(\omega t)\vec{i}+R\omega\cos(\omega t)\vec{j}$$

$$|\vec{v}(t)|=R\omega$$

$$\hat{v}(t)=-\sin(\omega t)\vec{i}+\cos(\omega t)\vec{j}$$

$$\vec{a}(t)=-R\omega^2\cos(\omega t)\vec{i}-R\omega^2\sin(\omega t)\vec{j}$$

$$|\vec{a}(t)|=R\omega^2$$

$$\hat{a}(t)=-\cos(\omega t)\vec{i}-\sin(\omega t)\vec{j}$$

### Solution

Coming soon…

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