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Lisa [10]
3 years ago
5

Is 2.5m/s faster than 4m/s

Physics
1 answer:
-Dominant- [34]3 years ago
5 0
No because 4 is greater
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Velocity can best be described by which of the following statements?
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A ball is thrown straight up. If the launch velocity is 15 m/s, at what SPEED will the ball return to the thrower’s hand?
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Vf = 15 m/s

Explanation:

First we consider the upward motion of ball to find the height reached by the ball. Using 3rd equation of motion:

2gh = Vf² - Vi²

where,

g = acceleration due to gravity = -9.8 m/s² (negative sign for upward motion)

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Vi = Initial Velocity = 15 m/s

Therefore,

2(-9.8 m/s²)h = (0 m/s)² - (15 m/s)²

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h = 11.47 m

Now, we consider downward motion:

2gh = Vf² - Vi²

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g = acceleration due to gravity = 9.8 m/s²

h = height = 11.47 m

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Vi = Initial Velocity = 0 m/s

Therefore,

2(9.8 m/s²)(11.47 m) = Vf² - (0 m/s)²

Vf = √(224.812 m²/s²)

<u>Vf = 15 m/s</u>

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