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dlinn [17]
2 years ago
8

A speed versus time graph is shown:

Physics
1 answer:
erma4kov [3.2K]2 years ago
6 0

In the given graph, from 4.0 s to 8.0 s, the object is at rest because the speed is zero.

In the given graph we can deduce the following;

  • at the time interval, 0 s to 3.5 s, the speed of the object = 1 cm/s
  • when the time, t= 4 s, the <em>speed</em> of the object = 0 cm/s
  • at the time interval, 4.0 s to 8.0 s, the<em> speed </em>of the object = 0 cm/s

When the <em>speed</em> of an object is zero (0), the object is simply at rest.

Thus, we can conclude that in the given graph, from 4.0 s to 8.0 s, the object is at rest because the speed is zero.

Learn more here:brainly.com/question/10454047

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a stone is thrown by a person from the top of the building, which is 200m tall. at the same time, another stone is thrown with v
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Answer:

The time after which the two stones meet is tₓ = 4 s

Explanation:

Given data,

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The velocity of the stone thrown from foot of the building, U = 50 m/s

Using the II equation of motion

                             S = ut + ½ gt²

Let tₓ be the time where the two stones  meet and x be the distance covered from the top of the building

The equation for the stone dropped from top of the building becomes

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The equation for the stone thrown from the base becomes

                S - x = U tₓ - ½ gtₓ²  (∵ the motion of the stone is in opposite direction)

Adding these two equations,

                      x + (S - x) = U tₓ

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∴                                  tₓ = 4 s

Hence, the time after which the two stones meet is tₓ = 4 s   

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3 years ago
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Thus, 7291.2 joules of work was done.

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