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0 = 20² - 2.10.h
= 400 - 20h
20h = 400
h = 20 m
2) vt² = vo² - 2gh
0² = vo² - 2.10.10
= vo² - 200
vo² = 200
vo = √200
= √100.√2
= 10√2 m/s
3) vt = vo + gt
= 10+ 10.2
= 10+20
= 30 m/s
4) h(t) = vo.t + 1/2 gt²
= 5. 2 + 1/2. 10.2²
= 10 + 20
= 30 m