A stone is allowed to fall from a top of a tower 100 m high and at the same time another stone is projected vertically upwards from the ground with a velocity of 25 m/s.The two stones will melt after :

A stone is allowed to fall from a top of a tower 100 m high and at the

1.	A stone is allowed to fall from a top of a tower 100 m high and at the same time another stone is projected vertically upwards from the ground with a velocity of 25 m/s.The two stones will melt after :
Answer» 40s 0.4S 4s 0.04s Solution :`X = (1)/(2) G t^(2) "" . . . (1) ` ` s = ut - (1)/(2) g t^(2)` `100 - x = 25 t - (1)/(2) g t^(2) "". . . (2)` Adding (1) and(2) we get , 100 = 25 t `:. t = (100)/(25) = 4s`