Question

A ball is thrown upward at 4 meters per second starting from ground level. how long does it take for the ball to return to the ground?

Answer 1

Answer:

from its upward velocity (ignoring air friction and other stuff). Therefore, it comes to rest after 3 seconds; since its average velocity during those 3 seconds was 15m/s . it will have traveled to an altitude of 45m above the ground.