An object is in free-fall motion, taking g=10m/s 2, then the size of the object's velocity at the end of the 5th s is________
A. 25 m/s
B. 50 m/s
C. 100 m/s
D. 125 m/s
Answer:B
An object is in free-fall motion, taking g=10m/s 2, then the size of the object's velocity at the end of the 5th s is________
A. 25 m/s B. 50 m/s C. 100 m/s D. 125 m/s