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A 1-kg ball in the air has an initial velocity vo = [ -20 ] i...

A 1-kg ball in the air has an initial velocity vo = [ -20 ] 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 momentum pi of the ball?
-20  i +  -20  j kg*m/s


What is the impulse or change in momentum ∆p of the ball?
0  i +  -10  j kg*m/s


What is the final momentum pf of the ball?
-20  i +  -30  j kg*m/s

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


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


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

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

Remember that the net work on the ball Wnet = ∆K = W1E * ∆y. Do not forget that the ball is falling, so its change in height is negative.

I need some help with this question. PLEASE HELP me.

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