Posted by **sam** on Saturday, June 28, 2014 at 6:14pm.

The velocity of a ball changes from ‹ 8, −5, 0 › m/s to ‹ 7.88, −5.28, 0 › m/s in 0.04 s, due to the gravitational attraction of the Earth and to air resistance. The mass of the ball is 140 grams.

I calculated the acceleration and got <-3,-7,0>

what is the equation to find the rate of change of momentum of the ball?

- physics -
**Damon**, Saturday, June 28, 2014 at 6:36pm
Force = rate of change of momentum = m a if mass is constant

(7.88 - 8)/.04 = -3

(-5.28+5) /.04 = -7

(0 - 0 ) = 0

so yes

m a = .140 (do it in kg) * that a vector

- physics -
**Damon**, Saturday, June 28, 2014 at 6:38pm
By the way, Newton 2 is

force = rate of change of momentum

F = m A is the simple version but will not work if mass is not constant (rocket or special relativity for example)

## Answer This Question

## Related Questions

- biology - Given the part of the molecule shown below, can the underlined atom ...
- Physics - A ball of volume V=8 L is full of air with pressure higher than ...
- Physics - A ball of volume V=8 L is full of air with pressure higher than ...
- Physics - If the gravitational force on you is 670N on the earth, how strong is ...
- calculus - When a ball is thrown vertically upward into the air with a velocity ...
- Physics - A geostationary satellite orbits the Earth in such a manner that it is...
- Grade 12 Calculus - Evaluate each of the following. Show all your calculations...
- mit - A spacecraft of mass m is first brought into an orbit around the earth. ...
- physics - Four charges −8 × 10^−9 C at (0 m, 0 m), −7 × 10^&#...
- calculus (gr 12) - Evaluate each of the following. Show all your calculations. a...

More Related Questions