According to one theory, glassy meteorites(tektites) found on the surface of the Earth originate in volcanic eruptions on the moon. With what minimum speed must a volcano on the Moon eject a stone if it is to reach the Earth? With what speed will this stone strike the surface of the Earth? In this problem ignore the orbital motion of the Moon around the Earth; use data for the Moon-earth system. (Hint: When the rock reaches the intermediate point where the gravitational pulls of the Moon and the Earth cancel out, it must have zero velocity)