A penguin slides down a 12m slope. If it takes the penguin 4s to reach the bottom, What was the penguin's velocity?
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Expert's answer
2011-10-14T08:50:05-0400
The motion is accelerated (by gravity force) hence the velosity v=v0+at, a -acceleration the way travelled s=s0+v0t+at^2/2 we assume that the initial velosity of the penguin v0=0 hence s=at^2/2 a=2s/t^2=1.5m/s^2 v=1.5*4=6 m/s - the final velosity at the end of the slope motion is accelerated so the velosity is changing during penguin's sliding
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