Calculating Momentum of a Dropped Ball: Help!

[Sucks@Physics]

Help! Momentum

A ball, of mass 100g, is dropped from a height of 16m. Its momentum when it strikes the ground is?

How do you do this calculation?

Thanks!

 

[catkin]

What have you tried? Do you know what momentum is?

 

[Dick]

First you compute the velocity. Then you remember the definition of momentum. Get started with the first part.

 

[Sucks@Physics]

Dont' I have to have time to calculate velocity? i know p=mv i just don't know the velocity

 

[Vidatu]

Look in the formulas sticky, at the top of this page. There''s one in there which you can use to solve this.

 

[Sucks@Physics]

i do not see the formula??

 

[Vidatu]

v^2 = v_0^2 + 2 a \Delta x

\Delta x is the displacement.

 

[Sucks@Physics]

i end up getting 313.6 m/s that can't be right? a= gravity correct?

 

[Vidatu]

You're putting in some formula wrong. Show whet you are doing, and we'll tell you where you messed up.

 

[Sucks@Physics]

0+(2x9.8x16) = 313.6

 

[Vidatu]

Check the formula again.

 

[Sucks@Physics]

grrr I am stupid

 

[patrickking]

Yah A= -9.80 (Or 9.80 down) Thats the gravational force pulling down.