PHYSICS MIDDLE SCHOOL

A golf ball reaches a height of 150 m before it stops rising and starts to fall to the ground. What is the golf balls speed (rounded to the nearest whole number) right before it hits the ground?

Answers

Answer 1

Answer:

Answer:

v = 54 m/s

Explanation:

Given,

The maximum height of the flight of golf ball, h = 150 m

The velocity at height h, u = 0

The velocity of the golf ball right before it hits the ground, v = ?

Using the III equations of motion

v² = u² + 2gh

Substituting the given values in the above equation,

v² = 0 + 2 x 9.8 x 150 m

= 2940

v = 54 m/s

Hence, the speed of the golf ball right before it hits the ground, v = 54 m/s

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Explain the Impulse-Momentum Theorem.

Answers

The impulse-theorem states that the change in momentum of an object is equal to the impulse exerted on it

Explanation:

The impulse-theorem states that the change in momentum of an object is equal to the impulse exerted on it.

Mathematically, we have:

- The impulse is defined as the product between the force exerted (F) and the duration of the collision ( $\Delta t$ ):

$I=F \Delta t$

- The change in momentum is equal to the product between the mass of the object (m) and the change in velocity ( $\Delta v$ ):

$\Delta p = m \Delta v$

So, the theorem can be written as

$F\Delta t = m \Delta v$

This theorem can be proved by using Newton's second law. In fact, we know that

$F=ma$ (1)

where a is the acceleration of the object. However, we can re-write the acceleration as the rate of change of velocity:

$a=(\Delta v)/(\Delta t)$

Therefore, (1) becomes:

$F=m(\Delta v)/(\Delta t)$

And by re-arranging,

$F\Delta t = m \Delta v$

Which is exactly the formula of the impulse theorem.

Learn more about impulse and momentum:

brainly.com/question/9484203

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Answers

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Two or more atoms joined into a single particular form a(n)

Answers

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Answers

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Why does the energy of a sound wave decrease over time

Answers

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The medium usually determines the speed of the wave travelling through it.

As the sound waves travel in a medium, this medium begins to decrease, therefore, the energy of the sound also decreases.

What are the starting ingredients and products of photosynthesis and cellular respiration

Answers

Photosynthesis makes the glucose that is used in cellular respiration to make ATP. The glucose is then turned back into carbon dioxide, which is used in photosynthesis. While water is broken down to form oxygen during photosynthesis, in cellular respiration oxygen is combined with hydrogen to form water.

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