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A 1-kg ball in the air has an initial velocity vo = [ 10 ] i...

A 1-kg ball in the air has an initial velocity vo = [ 10 ] i + [ -20 ] j m/s. It falls for a total time of 1 s. Assume that positive x-values are to the right and positive y-values are upward.

What is the initial kinetic energy Ki of the ball?
J

Remember that the initial kinetic energy Ki = pi2/2m. To find the magnitude of the resultant momentum we must use the pythagorean theorem on the x and y components. This gives us a square root, which is then squared: Ki = (pxi2 + pyi2)/2m.
Incorrect. Tries 1/2 Previous Tries


What is the final kinetic energy Kf of the ball?
J

Tries 0/2


What is the change in kinetic energy ∆K of the ball?
J

Tries 0/2

What is the ball's change in height ∆y after it falls 1 s?

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