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A keance is standing on a statuemary 23 by skateboard. If the learner jumps at a webody of 1 37 must forwand, the skateboard's velocity becomes A,$ mal back ward Calculate the mass of the learner? A 110 kg astronaut and a 4 010 kg spacecraft are attached by a tethering cable. Both masses are motionless relative to an observer near the spacecraft. The astronaut wants to return to the spacecraft, so he pulls on the cable until his velocity is 0,8 ms' toward the spacecraft. a) Calculate the change in velocity of the spacecraft? by Explain how pulling on the tethering cable in one direction causes the astronaut to move in the opposite direction. A 35 kg hunter is in a 10 kg stationary canoe, on the water. He throws a 0,72 kg spear at a velocity of 12 ms' to the right a) Calculate the velocity of the canoe and hunter immediately after the spear is released. hi How would this calculated velocity be affected if a spear of greater mass was thrown at the same velocity? A student on a skateboard, with a combined mass of 78,2 kg, is moving east at 16 mis As he goes by, the learner skillfully scoops his 6.4 kg school bag from