Dan is gliding on his skateboard at 2.56 m/sm/s . He suddenly jumps backward off the skateboard, kicking the skateboard forward at 6.22 m/sm/s (as measured by an observer on the ground). Dan's mass is 42.1 kgkg and the skateboard's mass is 5.99 kgkg . If the jump requires 0.122 ss to complete, what average force did Dan exert on the skateboard?

College Physics
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Chapter1: Units, Trigonometry. And Vectors
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Dan is gliding on his skateboard at 2.56 m/sm/s . He suddenly jumps backward off the skateboard, kicking the skateboard forward at 6.22 m/sm/s (as measured by an observer on the ground). Dan's mass is 42.1 kgkg and the skateboard's mass is 5.99 kgkg .

If the jump requires 0.122 ss to complete, what average force did Dan exert on the skateboard?
 
 
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