91影视

Average speed is the ratio of the total distance travelled to that of the total time taken to travel that distance.

a.

Substituting values in the above equation, we get,

$\begin{array}{c}\mathrm{S}=\frac{2脳3.14脳1.5脳{10}^{11}\text{鈥尘}}{365脳24脳3600\text{鈥塻}}\\ \mathrm{S}=3脳{10}^4\text{鈥尘/蝉}\end{array}$

Hence the average speed of the earth around the sun is$\mathbf{30000}\text{鈥尘/蝉}$ .

The average velocity is the ratio of the average displacement to that of the time period.

In the case of circular motion, after one year, the earth is coming back to its initial position.

b.

Hence displacement will be zero.

$\text{础惫别谤补驳别鈥塿别濒辞肠颈迟测=}\frac{\text{罢辞迟补濒鈥塂颈蝉辫濒补肠别尘别苍迟}}{\text{罢辞迟补濒鈥涂颈尘别}}$

Substituting values in the above equation, we get,

$\begin{array}{c}\mathrm{V}=\frac{0}{1\text{鈥�}\mathrm{year}}\\ \mathrm{V}=\frac{0}{365脳24脳3600}\\ \mathrm{V}=0\text{鈥尘/蝉}\end{array}$

Hence the velocity will be zero, and the speed will be 0 m/s.