| 14 Feb |  |
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SpikyRock subscribed to the topic Friction |
| 14 Feb | |
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SpikyRock subscribed to the topic Energy |
| 14 Feb | |
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SpikyRock subscribed to the topic Force |
| 14 Feb |  |
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SpikyRock asked A force of 20 N acting on an object of mass 2.0 kg |
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