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irina1246 [14]
3 years ago
7

A ball rolls from x = - 5m to x = 0m in 1 second . What was its average velocity? (Units = m/s) Don't forget: velocities and dis

placements to the right are +, to the left are -
Physics
1 answer:
katrin2010 [14]3 years ago
8 0

Answer:

+ 5 m/s

Explanation:

change in displacement = ΔX=final position - initial position

                                            ΔX = 0-(-5) =0+5 =+ 5 m

average velocity =  ΔX/t

                             = +5/1

                             = + 5 m/s

positive sign shows that ball rolls towards right

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A tennis ball is dropped from a roof. If it takes 38.9 seconds to reach the ground, how fast is the ball moving just before it h
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Answer:

The velocity of the ball before it hits the ground is 381.2 m/s

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h = ¹/₂(9.8)(38.9)²

h = 7414.73 m

The velocity of the ball before it hits the ground is given as;

v² = u² + 2gh

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v is the final velocity of the ball before it hits the ground

v² = 2gh

v = √2gh

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v = 381.2 m/s

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5 0
3 years ago
A sports car is advertised to be able to stop in a distance of 50.0 m from a speed of 80 km. What is its acceleration and how ma
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Explanation:

Given that,

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v^2-u^2=2ad

a=\dfrac{v^2-u^2}{2d}

a=\dfrac{0-(22.22)^2}{2\times 80000}

a=-0.00308\ m/s^2

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a=\dfrac{-0.00308}{9.8}\ m/s^2

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What are the comparisons and contrast of adaptation and natural selection? ASAP!!!!!!
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Answer:

Natural selection is a mechanism, or cause, of evolution.

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