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-Dominant- [34]
3 years ago
14

you're riding on a train that's moving at 5 km/h and you roll a ball down the aisle at 2 km/h in the same direction as the train

is moving. if a person standing on the ground near the train track could see the ball how fast would it appear moving
Physics
1 answer:
jekas [21]3 years ago
3 0
Just add the 2 and 5.
7 km/h
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Answer:

a   W_{3.5} = 490 \  J

b  W_{2.5} =  250 \  J

Explanation:

Generally the force constant is mathematically represented as

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substituting values given in the question

=>   k  = \frac{16}{0.2}

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Generally the workdone  in stretching the spring 3.5 m is mathematically represented as

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Generally the workdone  in compressing the spring 2.5 m is mathematically represented as

        W_{2.5} =  \frac{1}{2}  *  k  *  (2.5)^2

=>      W_{2.5} =  \frac{1}{2}  *  80 *  (2.5)^2

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Answer:

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