An object fallen freely from top of tower reaches at ground in 4s, then find the height of tower. (Take g = 10 ms^(-2))

An object fallen freely from top of tower reaches at ground in 4s, the

1.	An object fallen freely from top of tower reaches at ground in 4s, then find the height of tower. (Take g = 10 ms^(-2))
Answer» 20 m 40 m 80 m 160 m Solution :For object FALLING FREELY, `d = v _(0)t + (1)/(2) G t^(2)` `d = 1/2 g t ^(2) (v _(0) =0 and a =g)` `therefore d = 1/2 (10) (4) ^(2) = 80m`