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Musya8 [376]
2 years ago
7

6. A man with a mass of 75 kg standing on a skateboard is holding a medicine ball that has

Physics
1 answer:
Nezavi [6.7K]2 years ago
5 0

Answer:

Explanation:

Conservation of momentum

a) the man and skateboard move to the right.

b) His speed depends on the reference frame of the ball speed.

If the speed of the ball is 10 m/s relative to ground and the man's final speed is v, then.

(75 + 20)(0) = 20(10) + 75(v)

v = -200/75 = -2.6666...

|v| = 2.7 m/s relative to the ground

This is the likely answer they are seeking.

If the ball is thrown with a speed of 10 m/s relative to the man

(70 + 20)(0) = 20(v + 10) + 75v

20v + 200 = - 75v

          200 = - 95v

               v = -2.105... m/s velocity or a speed of

<em>               |v| = 2.1</em> m/s relative to ground

and the ball has a velocity of 10 - 2.1 = <em>7.9 m/s </em>relative to ground.

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Answer:

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Explanation:

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