Question 724419: A projectile is fired upward with an initial velocity of 588 m/sec. After how many minutes will it hit the ground? Answer by KMST(5328) (Show Source):
You can put this solution on YOUR website! If that projectile is fired from ground level, its height (in meters) t seconds after being shot would be give by the equation (the 4.9 number is half of the acceleration of gravity in ).
Solving would give us the time when it hits the ground.
Dividing both sides of the equation by we get so the projectile is at ground level at t=0 (we knew that) and at t=120, .
