A body dropped from height 20 m on horizontal ground. Then, check which of the following options are correct. (g = 10 m/s²)
A. the time taken by the body in reaching the ground is 2 s
B. the time taken by the body in reaching the ground is 4 s
C. the velocity of the body on reaching the ground is 20 m/s
D. the velocity of the body on reaching the ground is 40 m/s