# Problem 4-11 - Free fall - Part 2 - (A)

A ball is thrown from a balloon with an initial unknown velocity. The ball accelerates at $\mathrm{9.80\;m/s^2}$ downward for $\mathrm{2.00\; s}$, at which time its instantaneous velocity is $\mathrm{24.0\; m/s}$ at an angle of $\mathrm{45.0^\circ}$ below the horizontal. Determine the magnitude and direction of the initial velocity.

Accumulated Solution

$\mathrm{v = v_0 + at}$

Correct.

The final velocity is given and the initial velocity is unknown.

We need a coordinate system in which to solve the problem. Which of the following is best (remember there is actually no incorrect one).

(A)

(B)

(C)

(D)