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Abah Derek Abah
Questions (1)
Calculate the height from rest if its velocity just before hitting the ground is 30m/s
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Answers (2)
h=? , v=30m/s , g=10m/s^2 using v^2=u^2 + 2gh, 30^2 =2 × 10 × h 900 = 20h therefore h = 900/20 h=45
s= ut +1/2at^2 , but t=4/2 = 2s , u=0 , a= 10m/s therefore, s= 0×2 + (10× 2^2)/2 s=(10×4)/2 s=40/2 = 20
