Skateboarder at the bottom of the ramp
A 61 kg skateboarder is moving down a ramp with a 7.0 m radius of curvature. At the bottom of this ramp he reaches a speed of 7.8 m s. What upward force acts on the skateboarder at the bottom of the ramp?
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Exoskeletal, what is the name shell of squid and earthworm and octopus .......................................?
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