Question

A football is kicked at a velocity of 10.5 m/s, 45 degrees above the horizon. After the ball has traveled only horizontally 3.5 m, a member of the opposing team manages to tip the ball with a velocity of 4.5 m/s at an angle of 70 degrees above the horizon. What is the resultant vector of the ball after the tip?

Answer 1

You have just said what the vector (velocity) of the ball is just after the tip. (4.5 m/s at an angle of 70 degrees above the horizon)

What "resultant vector" are you talking about?

Before it is tipped, its vector velocity will have changed due to the action of gravity.