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4 years ago

14

Rest and motion are inter-related to each other, explain

2 answers:

DerKrebs [107]4 years ago

7 0

An object in motion will stay in motion until a force is acted upon it, and object at rest will stay at rest until a force is acted upon it.

mamaluj [8]4 years ago

3 0

Answer:

Rest and motion are the relative terms because they depend on the observer's frame of reference. So if two different observers are not at rest with respect to each other, then they too get different results when they observe the motion or rest of a body.

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A marble is thrown horizontally with a speed of 7 m/s. When the marble lands, it hastraveled a horizontal displacement of 30 m.

Alex Ar [27]

Answer:

t = 4.28 s

Explanation:

The horizontal speed of a marble = 7 m/s

The horizontal displacement covered by the marble = 30 m

We need to find the time for which the marble is in air. Let the time is t. Using the formula for speed to find it as follows :

$s=\dfrac{d}{t}\\\\t=\dfrac{d}{s}\\\\t=\dfrac{30\ m}{7\ m/s}\\\\=4.28\ s$

So, it will in the air for 4.28 s.

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4 years ago

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mario62 [17]

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3 years ago

Which of the following is an example of acceleration? I. A car speeds up. II. A car slows down. III. A car travels in a straight

svetlana [45]

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6 0

4 years ago

A supply plane needs to drop a package of food to scientists working on a glacier in Greenland. The plane flies 110 m above the

zysi [14]

Answer:

The distance is 709.5 m.

Explanation:

Given that,

Speed = 150 m/s

Distance = 110 m

Suppose, How far short of the target should it drop the package?

We need to calculate the time

Using equation of motion

$s=ut+\dfrac{1}{2}gt^2$

$t^2=\dfrac{2s}{g}$

Where, g = acceleration due to gravity

t = time

Put the value into the formula

$t=\sqrt{\dfrac{2\times110}{9.8}}$

$t=4.73\ sec$

We need to calculate the distance

Using formula of distance

$d= vt$

Put the value into the formula

$d=150\times4.73$

$d=709.5\ m$

Hence, The distance is 709.5 m.

8 0

3 years ago