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A ball is thrown downward at a speed of 40 meters per second from an altitude of 781 meters Approximately how long does it take to reach the ground?
At the time the ball is thrown, which is "time 0" the downward speed is 40 m/s.
Each second, the downward speed will increase by 9.8 m/s.
1. Work out the speed at the end of the first second. This will be 49.8 m/s.
2. Then work out how many meters it would have gone in the first second.
3. Now work out the ball's height. This is the height at "time 1".
4. Draw the ball at time 0 and time 1 on a sheet of paper to help you think.
Now, repeat steps 1-4 until the ball's height is close to 0 or goes past 0. Your current "time X" will tell you how many seconds went by for it to get that far.
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