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# Dan is gliding on his skateboard at 3.5 m/s. He suddenly jumps backward off the skateboard, kicking the skateboard forward at 8.0 m/s. How fast is

Dan is gliding on his skateboard at 3.5 m/s. He suddenly jumps backward off the skateboard, kicking the skateboard forward at 8.0 m/s. How fast is Dan going as his feet hit the ground? Dan's mass is 65 kg and the skateboard's mass is 5.0 kg