# Answer to Question #4608 in Mechanics | Relativity for greyci

Question #4608

A penguin slides down a 12m slope. If it takes the penguin 4s to reach the bottom, What was the penguin's velocity?

Expert's answer

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

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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