Originally Posted by

**The0wn4g3** I need some help with this homework problem:

1. A two inch diameter craft ball is thrown vertically. This initial velocity of the ball is 20 ft/s.

1. Neglecting drag, draw a free body diagram and formulate a first order ODE that governs the velocity of the ball. Is the ODE linear or non-linear?

My answer: Linear, F=ma so dv/dt * m =m*g hence, dv/dt = g.

2. Use Euler’s first order method to determine the “drag free” time required to achieve maximum elevation. Check your solution with the analytic solution to the ODE that governs the motion of the ball.

My answer: I do not know if my ODE in part 1 is correct?

The analytic solution will be V = g*t +Vo.