if an object is thrown upward from a tower of height hundred M with a velocity of 20 m per second how long will it take us
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H=-UT+I/2GT^2 IS THE FORMULA FOR AN OBJECT THROWN FROM A TOWER(PROOF IN HC VERMA)
100=20t+1/2*10*t^2
5t^2+20t-100=0
t^2+4t-20=0
t=-2+2ROOT6 other root is negative
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