Question

Hey dudes !! Hope u can answer thiese questions.
plz answer question 6-9.

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Answer 1

Answer:

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Explanation:

9. Average speed is = L / ( t1+ t2)

t1 = L /(2 v1) & t2 = L /(2 v2)

L/ ( t1+ t2) = 2v1v2/ ( v1+ v2)

Average speed is 2 v1v2 / ( v1 + v2)

or

9.v1=L/2/t1,v2=L/2/t2

L=2v1t1,L=2v2t2

t1=L/2v1,t2=L/2v2

Vavg=total distance/total time=L/(L/2v1+L/2v2)

Vavg=(L/L/2)*1/(1/v1+1/v2)=2v1v2/v1+v2

6.The angle made by the given vector will be 45°

solution

From a general form of vector written as vector , when the given vector  is compared,  

We get,  

x = 1  

and  

y = 1

And we know,  

where θ is the angle made by the vector with x axis.

Hence, the angle (θ) made by the vector  with the x-axis is 45°.

Vavg=(2v1v2)/(v1+v2)

Answer 2

Answer:

Ella89 help u

Explanation: