A ball with a mass of $3 kg$ is rolling at $15 m/s$ and elastically collides with a resting ball with a mass of $4 kg$ . What are the post-collision velocities of the balls?

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A ball with a mass of $3 kg$ is rolling at $15 m/s$ and elastically collides with a resting ball with a mass of $4 kg$ . What are the post-collision velocities of the balls?

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Answer 1 · 2016-02-15T09:34:18

$v_1=-15/7 m/2$
$v_2=90/7$ m/s

Explanation:

$"we must use conservation of momentum to solve this problem."$
$vec P_1+ vec P_2=vec P_1^'+vec P_2^'$
$3*15 +0=3*v_1+4*v_2$
$15+v_1=0+v_2$
$v_1=v_2-15$
$3.15=3(v_2-15)+4*v_2$
$45=3*v_2-45+4*v_2$
$90=7*v_2$
$v_2=90/7$ m/s
$v_1=90/7-15$
$v_1=-15/7 m/2$

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A ball with a mass of $3 kg$ is rolling at $15 m/s$ and elastically collides with a resting ball with a mass of $4 kg$ . What are the post-collision velocities of the balls?

1 Answer

Explanation:

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Impact of this question

Science

Math

Humanities

... and beyond

A ball with a mass of 3 kg 3 kg is rolling at 15 m/s15 m/s and elastically collides with a resting ball with a mass of 4 kg4 kg. What are the post-collision velocities of the balls?

1 Answer

Explanation:

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Impact of this question

A ball with a mass of $3 kg$ is rolling at $15 m/s$ and elastically collides with a resting ball with a mass of $4 kg$ . What are the post-collision velocities of the balls?