• anonymous
a ball thrown vertically upwards from level ground is observed twice, at a height H above the ground, within a time interval t.The initial velocity of the ball was a. $\sqrt{8gH+g ^{2}t ^{2}}$ b. $\sqrt{8gH+\left( gT/2 \right)^{2}}$ c.$1/2\sqrt{8gH+g ^{2}t ^{2}}$ d. $\sqrt{8gH+4g ^{2}t ^{2}}$
Physics

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