A100-kg athlete is performing a vertical leap to test his leg strength. he leaves the ground at 3.20 m/s, zooms upward to some maximum altitude, and then returns to the ground. as he lands, he bends his legs and crouches down, so that he moves 30 cm downward as he comes to a stop. what average force did the athlete’s legs exert on the ground as he landed?

Julia would be observing a. static electricity was caused by her sweater rubbing against her shirt and transferring electrons. she didn't touch anything metal, so that would cancel out b.she most likely didn't rub her sweater against her hair either, so that cancels out c.she also didn't scoot across the carpet while trying to take her sweater off, that cancels out d.so that leaves a.a. is correct.

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