Change in direction of velocity

[ahmed emad]

Homework Statement

If my car was moving to the right then I changed direction of motion to down, and the speed is constant and =5m\s, how to calculate acceleration

Homework Equations

Δv=vf-vi

The Attempt at a Solution

Make vectors addtion and use pythagorean theorem formula, so change in v will be : 5✓2.

 

[Doc Al]

Looks like you found the magnitude of the change in velocity. But that's not the acceleration. (How much time was involved?)

 

[ahmed emad]

Sorry i forgrot write it , time is 2s

 

[Doc Al]

OK, so how do you calculate average acceleration?

 

[ahmed emad]

A=∆v/t so 5✓2 /2 , is that right?

 

[Doc Al]

A=∆v/t so 5✓2 /2 , is that right?

Looks good. But don't forget to attach the appropriate units.

 

[ahmed emad]

But is the direction of acceleraion will be the direction of ∆v? And can I use kinimaticts fourmlas with this acceleration?

 

[Doc Al]

But is the direction of acceleraion will be the direction of ∆v?

Yes, the direction of the average acceleration will be in the direction of Δv.

And can I use kinimaticts fourmlas with this acceleration?

What did you have in mind? Is there more to this problem? (Be careful not to apply formulas meant for 1D motion with constant acceleration.)

 

[ahmed emad]

No it's just was an addition from me , thank you so much , I understood it.