An object is thrown vertically from a height of #5 m# at # 8 ms^-1#. How long will it take for the object to hit the ground?
Assuming the object is thrown downward, the time taken will be
The question doesn't specify whether the object is thrown upward or downward. I will assume it is thrown downward. This means that the initial velocity,
Use the formula
Rearranging into standard form for quadratic equations:
Use the quadratic formula or your preferred method of solving quadratic equations and take only the positive root:
(If the assumption was that the object was thrown upward instead, the initial velocity and the acceleration would have opposite signs: the initial velocity would be