Question 387411
a) Speed is acceleration times time : 10m/s^2*6s=60m/s
 
b) the energy formula is : mv^2/2+mgh=cste => 
 at rest : 0
 after 6s : mv^2/2+mgh=0 => h = -v^2/2g = -60*60/2/10 = -180m
 
the ball is 180m lower.
 
Other calculation : Distance is one half acceleration time squared : 
 
d = gt^2/2 = 10*6*6/2= 180m