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What speed must you toss a ball straight up so that it takes 4 s to return to you?
Wiki User
∙ 11y ago
To toss a ball straight up so that it takes 4.0 seconds to return to you, it must be thrown at a speed of 19.6 meters per second. This is because it will have a speed of zero at 2.0 seconds, therefore it must have a speed of 19.6 meters per second for gravity's 9.8 meters per second squared to slow it to zero in 2 seconds.
Wiki User
∙ 9y ago
Wiki User
∙ 11y ago-- You want it to rise for 2 s and then fall for 2 s .
-- You know that gravity will decrease its upward speed by 9.8 meters per second
every second that it's in the air.
-- So you have to give it an initial upward speed of 19.6 meters per second in order
for it to continue rising for the first 2 seconds, before it runs out of upward gas.
That's about 43.9 miles per hour as it leaves your hand.
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== ==
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