A ball is thrown straight upward with a speed v from a point h meter above the ground. The time taken for the ball to strike the ground is
A. `(upsilon)/(g) sqrt(1-(2hg)/(upsilon^(2)))`
B. `(upsilon)/(g)sqrt(1+(2hg)/(upsilon^(2)))`
C. `sqrt(1+(2hg)/(upsilon^(2)))`
D. `(upsilon)/(g)[1+sqrt(1+(2hg)/(upsilon^(2)))]`