# A ball is thrown up solve for variables, kenimatics

1. Jan 25, 2012

### Rower93

A ball is to be shot from level ground with a certain speed v0 at various angles θ. The launch angle determines both the time of flight t and the minimum speed vmin the ball will have during its flight, which means they can be related to each other. At some angle, the ball will have a maximum possible time of flight. Call this time tmax. Find a formula which gives the ratio of vmin to v0 in terms of t, tmax, and g.

I honestly do not know where to go with this one, it has stumped my roommate and i for over an hour!

if simplified you can get an answer of vmin/v0 = v0 cos(theta)/v0 = cos(theta)

The computer does not accept this as a valid response.

Any help is appreciated,
Cheers!

2. Jan 26, 2012

### Staff: Mentor

You need to read the book and think of how the example problems in kinematics relates to this.

Break it into two parts the ball motion going up and then coming down and the motion of the ball going horizontally.