tanjsyn123 tanjsyn123

10-08-2020
Mathematics

contestada

The braking distance, D, of a car is directly proportional to the square of its speed, v. When d=5, v=10
Find d when v=70

Respuesta :

unicorn3125 unicorn3125

10-08-2020

Answer:

d = 245

Step-by-step explanation:

d is directly proportional to the square of a speed v

d = av²

5 = a•10²

5 = 100a

a = 0.05

d = 0.05v²

d = 0.05•70²

d = 0.05•4900

d = 245

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