Answered

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Which of the following statements is true of all rotations?

Sagot :

Answer:

21.25 m/s

Explanation:

AVERAGE SPEED=

= \frac{s1 t1+ s2t2 + s3t3}{t1 + t2 + t3}=

t1+t2+t3

s1t1+s2t2+s3t3

= \frac{20 \times 10 + 30 \times 5 + 15 \times 5}{10 + 5 + 5}=

10+5+5

20×10+30×5+15×5

= \frac{200 + 150 + 75}{20}=

20

200+150+75

= \frac{425}{20}=

20

425

= 21.25 ms=21.25ms

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