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2 years ago

Displacement is the difference between the initial position and the____ position of an object

1 answer:

4 0

<span>Displacement is the difference between the initial position and the FINAL position of an object.

Hope this helps!</span>

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What is the momentum of a 750 kg car traveling at a velocity of 25 m/s north?

olga_2 [115]

Answer:

18750 kg-m/s

Explanation:

Momentum = mass x velocity

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2 years ago

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What forces are those that act on an object causing the net force to be something other than zero?

Arisa [49]

Gravity is all ways pulling down and the normal force acting on top of the object and for it to have to push or pull to the object

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3 years ago

a 5.0 kg ball is dropped from a 2.5 m high window. what is the velocity of the ball just before it hits the ground?

julsineya [31]

Answer:

Approximately $7.0\; \rm m \cdot s^{-1}$ .

Assumption: the ball dropped with no initial velocity, and that the air resistance on this ball is negligible.

Explanation:

Assume the air resistance on the ball is negligible. Because of gravity, the ball should accelerate downwards at a constant $g = 9.81 \; \rm m \cdot s^{-2}$ near the surface of the earth.

For an object that is accelerating constantly,

$v^2 - u^2 = 2\, a \, x$ ,

where

$u$ is the initial velocity of the object,
$v$ is the final velocity of the object.
$a$ is its acceleration, and
$x$ is its displacement.

In this case, $x$ is the same as the change in the ball's height: $x = 2.5\; \rm m$ . By assumption, this ball was dropped with no initial velocity. As a result, $u = 0$ . Since the ball is accelerating due to gravity, $a = 9.81\; \rm m \cdot s^{-2}$ .

$v^2 - u^2 = 2\, g \cdot h$ .

In this case, $v$ would be the velocity of the ball just before it hits the ground. Solve for

$v^2 = 2\, a\, x + u^2$ .

$\begin{aligned}v &= \sqrt{2\, a\, x + u^2} \\ &= \sqrt{2\times 9.81 \times 2.5 + 0} \\ &\approx 7.0\; \rm m\cdot s^{-1}\end{aligned}$ .

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2 years ago

When you answer someones question how do you make it so your answer is verified??

malfutka [58]

Well YOU cant make your questions verified. if theres more than one answer to the question the person who asked the question will choose the best answer. usually based upon like how well it explains and if its the right answer

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2 years ago

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The bending of light when it changes media is called

olchik [2.2K]

That's called "refraction".

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2 years ago

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