Question

What force, acting for 1.35 x 10^-3 s, changes the velocity of a 95g baseball from 50.0ms^-1 eastward to 45.0 ms^-1 westward?

Answer 1

Newt's 2nd Law:\[Force = mass \times acceleration\]
\[Acceleration = \Delta velocity/\Delta time\]
\[(V_{final} - V_{initial})/\Delta time = [45.0 - (-50.0)]/(1.35x10^{-3})\]
Can you figure it out from here?

Answer 2

what is 1.35*10^-3?

Answer 3

.00135?

Answer 4

Yep!

Answer 5

i got 70370.37 for my answer

Answer 6

In what unit?

Answer 7

Newtons

Answer 8

Actually no - what you've figured out is the acceleration in meters per second squared. That's the 2nd and 3rd equations in my first post. Great job - you're almost there.

Now that you've got the acceleration, how would you get the force? (Be careful - watch your units.)