Thread: Check this one out Physics

A rock is thrown vertically upward with a speed of 15 m/s. What are its speed and direction 2 s later?

v1= 15 m/s
t= 2s
A = -9.8 m/s^2

V2= (-9.8)(2) + 15
-19.6 + 15
-4.6 m/s and it goes up

Ok this looks right but?

Originally Posted by Louisana1

A rock is thrown vertically upward with a speed of 15 m/s. What are its speed and direction 2 s later?

v1= 15 m/s
t= 2s
A = -9.8 m/s^2

V2= (-9.8)(2) + 15
-19.6 + 15
-4.6 m/s and it goes up ???

Ok this looks right but?

come on LA1 ... what does the negative sign tell you regarding the rock's direction of motion?

That it goes down???

Originally Posted by Louisana1

That it goes down???

yes ... vectors have both magnitude & direction.