A ball is thrown vertically upward with a speed v from a height h metre above the ground. The time taken for the ball to hit ground is
vg1−2hgv2
vg1+2hgv2
vg1+1+2hgv2
1+2hgv2
−h=vt−12gt2gt2−2vt−2h=0t=2v+4v2+8gh2g =vg1+1+2hgv2