The first active volcano observed outside the Earth was discovered in 1979 on Io, one of the

Question:

The first active volcano observed outside the Earth was discovered in 1979 on Io, one of the moons of Jupiter. The volcano was observed to be ejecting material to a height of about 3.00 × 105 m. Given that the acceleration of gravity on Io is 1.80 m/s2, find the initial velocity of the ejected material.