Question

A stone is dropped from a ballon moving upwards with velocity of 4.5m/s the stone reaches the ground in 5 sec calculate the height of the ballon when the stone was dropped

Answer 1

h= - ut + 1/2 g t^2
put u= 4.5 and t= 5 to get h

Answer 2

S = ut +1/2 gt2
S = - 4.5 *5 +1/2*10*5*5= - 22.5 +125 =102.5 m