A Ball Is Thrown Horizontally from the Top of a 20-M

Multiple Choice

A ball is thrown horizontally from the top of a 20-m high hill.It strikes the ground at an angle of 45 $\degree$ .With what speed was it thrown? Use g = 10 m/s².

A) 14 m/s
B) 20 m/s
C) 28 m/s
D) 32 m/s
E) 40 m/s