# Find the magnitude of the velocity vector on impact

(resolved) find the magnitude of the velocity vector on impact

Thelma and Louise drive their '66 T-Bird convertible off a cliff. They are going 25.9 m/s and the cliff is 97 meters high. Find the magnitude of their velocity vector the moment they impact the ground. Make sure you do the following in your answer:

DO NOT include units. We'll deal with that in the next question.
Give precision to tenths (#.#).

so given y is -97, and vi is 25.9 m/s

equations for horizontal projectile motion for vf are
vyf=-g(t)
vf=sqrt of (vxf^2+vyf^2)
so far for t i had 4.447seconds

____
\/-2*-97
----------= 4.447
9.81

Last edited:

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mgb_phys
Homework Helper
You don't need the time.
You can use vf2 = vi2 + 2as for the vertical velocity
Since you ignore air resistance there is no change in the horizontal velocity.

And think of vxf and vyf as being two legs of a right triangle. The answer you're looking for is the hypotenuse of this triangle.

You don't need the time.
You can use vf2 = vi2 + 2as for the vertical velocity
Since you ignore air resistance there is no change in the horizontal velocity.
what is 2as????

mgb_phys