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Maksim231197 [3]
2 years ago
15

Mr. Johnson has 4 daughters. Each of his daughters has a brother. How many children does mr. Johnson have?.

Mathematics
1 answer:
777dan777 [17]2 years ago
5 0

Answer:

5

Step-by-step explanation:

hope this helps ;)

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2 years ago
A 1400 kg car moving +13.7 m/s makes an elastic collision with a 3200 kg truck, initially at rest. What is the velocity of the c
Kamila [148]

Answer:

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Step-by-step explanation:

An elastic collision is an encounter between two bodies in which the total kinetic energy of the two bodies remains the same.

let the following:

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m₂ = mass of the truck = 3200 kg

u₁ = velocity of the car before collision = 13.7 m/s

u₂ = velocity of the truck before collision = 0 m/s

v₁ = velocity of the car after collision

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v₁ = [ u₁ * (m₁ - m₂) + u₂ * 2m₂ ]/ (m₁ + m₂)

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2 years ago
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