A hot-air balloon is rising upward with a constant speed of 4.00 m/s. When the balloon is 4.77 m above the ground, the balloonist accidentally drops a compass over the side of the balloon. How much time elapses before the compass hits the ground?

Answer 1

u=4m/s
when constant speed, acceleration a=0
distance s=4.77
time t=?
s=u*t+1/2*a*t^2
s=u*t because a=0
t=s/u=4.77/4
t=1.77 sec.