Question

A ball is dropped from a cliff, what will be the velocity and acceleration after 2 second? Take g=9.8m/s2

Answer 1

v = u + gt 
v = 0 + 9.8(2) 
v = 19.6 m/s 

acceleration is always 9.8 m/s^2 in this case

Answer 2

U=0; a=9.8m/s2;t=2sec
V=u+at
V=9.8*2=19.6m/sec