A projectile is fired vertically from the surface of Earth at 8 km/s. The projectile will
A)go into circular motion about Earth.
B)rise and fall back to Earth's surface.
C)follow an uncertain path.

Question

Quizplus · Accepted Answer

The escape velocity from Earth is approximately 11.2 km/s. Since the projectile is fired at a speed less than this (8 km/s), it does not have enough energy to escape Earth's gravitational pull. Therefore, it will rise to a certain height and then fall back to Earth's surface.

A Projectile Is Fired Vertically from the Surface of Earth