It's simple algebra . . . Exactly where is your difficulty?
The question is: When is ?A ball is thrown straight up.
Its height in metres after seconds is: .
To the nearest tenth of a second, when is the ball 6m above the ground?
Explain why there is two answers.
We have: .
Quadratic Formula: . seconds.
It attains a height of 6 meters on the way up and on the way down.