Acceleration due to gravity is approx 9.8 metres/second2
So after 2.3 seconds, the velocity of the rock is 9.8*2.3 = 22.54 metres/second
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19.6 meters / 64.4 ft
If it started at rest, 4x40 is 160 metres per second
In order to come up with an answer, we have to impose a couple of rules: 1). we're trying this on the earth 2). we're ignoring the effects of air 3). it's not moving at the beginning of the 5 seconds ... that's when you drop it from your hand Then the rock falls 400 ft in five seconds. What's really interesting is that it doesn't matter how much it weighs. ALL rocks fall the same distance in 5 seconds.
they are a type of pop and rock type of band
False v=1/2 a t2 t=5s a=9.81m/s2 v=122.625 m/s