A baseball is hit directly upward with an initial speed of 43 m/s. Find the velo

Question

A baseball is hit directly upward with an initial speed of 43 m/s. Find the velocity of the ball when it is at a height of 39 m.
_____________________m/s

Is there one correct answer for v or two?

___________________________________

Explain why.

A Since the solution for velocity involves a square root we do get two answers.

B Only one of these answers has physical meaning. Since the solution for velocity does not involve a square root we do not get two answers.    

C Since the solution for velocity involves a square root we do get two answers. Both of these answers have physical meaning.

PLEASE explain!

Explanation / Answer

a) v^2 = v0^2 + 2 a y

v = sqrt(43^2 -2*9.81*39)= 32.9 m/s

two since + or - negative i.e. up or down

C)

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