Question

! If a volcano spews a 500 kg rock vertically upward a distance of 500 m, what was its velocity when it left the volcano?

Answer 1

The final velocity upon reaching its maximum height of 500 m will be 0 m/s.
Applying:
2as = v² - u², and taking the upward direction to be positive, the acceleration will be -9.81 m/s²

2 x 500 x -9.81 = -u²
u = 99.0 m/s