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Maru [420]
2 years ago
10

A kicked ball rolls across the grass and eventually comes to a stop in 4.0 sec. When the ball was kicked, its initial velocity w

as 20 mi/ hr. What is the acceleration of the ball as it rolls across the grass?
Physics
1 answer:
kotegsom [21]2 years ago
6 0

Answer:

-2.24 m/s²

Explanation:

Given:

v₀ = 20 mi/hr = 8.94 m/s

v = 0 m/s

t = 4.0 s

Find: a

v = v₀ + at

0 m/s = 8.94 m/s + a (4.0 s)

a = -2.24 m/s²

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A runner achieves a velocity of 11.1 m/s, 9 sec after he begins. What is his
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Answer:

1.23 m/s²

Explanation:

Given:

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1 year ago
The SAME amount of current I passes through three different resistors. R2 has twice the cross-sectional area and the same length
Snezhnost [94]

Answer:

resistor R₂ has the lowest current density

Explanation:

The current density is

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now let's analyze each case

a) R₂ has an area 2A₀ and a length L₀ that R₁

b) R₃ has an area Ao and a length 3L₀ what R₁

we can see that all the area is given in relation to the resistance R₁

 

the current density in R₁ is

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the current density in R₂

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the current density in R₃

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therefore resistor R₂ has the lowest current density

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