Nilufar Y.
asked • 04/17/20A rock is thrown with an initial speed of 30m/s. After 4 seconds, it’s speed is?
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1 Expert Answer
Larry F. answered • 04/18/20
Tutor
5
(11)
Retired Engineer with 6 Years of Substitute Teaching Experience
I will assume rock was thrown straight up. Look Out Below!!!!
Vf = vi + a t a= -9.81 m/sec2
vf = 30 + ( -9.81) 4 = 30-39.24 = -9.24 m/sec which means that it was on its way back down.
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Arturo O.
You need to provide more information, such as thrown horizontally, thrown vertically up, etc. Without this, we cannot answer the question completely.04/17/20