An object is dropped from a height of 100m, how long is it in the air?

Initial velocity Vi=0 m/sHeight= h= 100mand g=9.8m/s^2time=T=?using second equation of motion..h=ViT+(gT^2)/2h= (0)(T)+ (9.8/2) T^2h= 4.9 T^2100=4.9 T^2T^2=100/4.9T^2= 20.41T= sqrt (20.41)T= 4.52 sec

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