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horrorfan [7]
3 years ago
6

Lara takes 40 minutes to drive 20 miles north and then 20 miles south to end up at the same place. Calculate average speed and a

verage velocity
Mathematics
1 answer:
DiKsa [7]3 years ago
4 0

Answer:

30.mph

Step-by-step explanation:

20/20=1 40/20=2. 2 minutes for every mile 2 X 30=60 (60 minutes) 1 X 30=30 (30 miles)

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We know that { \tan }^{2} y =  { \sec }^{2} y - 1

Also , { \tan}^{2} y =   \frac{ { \sin }^{2} y}{ { \cos }^{2}y }

So ,

\frac{ { \sin }^{2}y }{ { \sec }^{2}y - 1 }  =  \frac{ { \sin}^{2} y}{ { \tan }^{2} y}  =  \frac{ { \sin }^{2}y }{ \frac{ { \sin}^{2} y}{ { \cos}^{2}y } }  =  { \cos }^{2} y

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