A ball is thrown vertically downward with a velocity of 20 m/s from the top of a tower. It hits the ground after some time with a velocity of 80 m/s. The height of the tower is: (Given g=10m/s2)
a. 340 m
b. 320 m
c. 300 m
d. 360 m
a. 340 m
b. 320 m
c. 300 m
d. 360 m