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Harman [31]
3 years ago
15

Use a common denominator to find-2/3 + -4/5​

Physics
1 answer:
Juliette [100K]3 years ago
6 0

Answer:

-22/15

Explanation:

the least common denominator is  15 so first you multiply -2/3 by 5 in both the numerator and denominator making it -10/15

Then you do the same to -4/5 except you multiply the numerator and denominator by 3 giving you -12/15

If you add -10/15+ -12/15 you get -22/15

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Answer:

F_f=840N

Explanation:

From the question we are told that

Weight of fireman W_f= 87.5kg

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Final speed is V_f 1.75m/s

Generally the equation for velocity is mathematically represented as

v^2 = v_0^2 + 2 a d

Therefore Acceleration a

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a'= 0.21m/s^2

Generally the equation for Frictional force F_f is mathematically given as

F_f=m*a

F_f=m*(g-0.21)

F_f=87.5*(9.81-0.21)

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a

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