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e-lub [12.9K]
3 years ago
14

In a perfectly inelastic one-dimensional collision between two objects, what condition alone is necessary so that the final kine

tic energy of the system is zero after the collision?
Physics
2 answers:
dem82 [27]3 years ago
8 0

Answer:

In all types of inelastic collision we know that two objects move together with same speed after collision.

Now we know that in this type of collision energy is lost due to its permanent change in shape or size

Now when two objects will collide then the total momentum of the system will remains conserved as there is no external force on the system

So here we can say that

m_1v_{1i} + m_2v_{2i} = (m_1 + m_2)v_f

now we know that after collision if system comes to rest

then we will have

v_f = 0

m_1v_{1i} + m_2v_{2i} = 0

so here final kinetic energy is zero in all types of inelastic collision when the two objects have initial momentum zero during their motion

Crank3 years ago
5 0
<span>The condition alone that is necessary so that the final kinetic energy of the system is zero after the collision is that the objects must have momenta with the same magnitude but opposite directions.</span>
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Answer:

(i) 12 seconds

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(iii) 132 meters from the initial position

(iv) No

Explanation:

Speed of express train =36 m/s

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The initial distance between the local train and passenger train =100 m.

Due to the application of breaks, the express train slows at the rare of 3.0 m/s^2.

So, the acceleration of the express train, a=-3 m/s^2.

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From the equation of motion,

v=u+at

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So, 0=36+(-3)t

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(ii) To compute the distance traveled, s, till the express train stops, using

v^2=u^2+2as

\Rightarrow 0^2=36^2+2(-3)s

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\Rightarrow s=216 meters.

(iii) The local train is moving at a speed of 11 m/s

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(iv) Let 0 be the reference position which is the initial position of the express train.

So, at the initial time, the position of the local train is at 100m.

After 12 seconds:

The position of the express train is at 216 m [using part (ii)]

and the position of the local train is at 100+132=232m  [using part (iii)].

So, the local train is still ahead of the express train, hence the trains didn't collide.

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3 years ago
How does brainly work i want to get used to this more often.
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Answer:

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Answer:

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