(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A car is rounding a curve on the interstate, slowing from 30 m/s to 22 m/s in 7.0 seconds. The radius of the curve is 30 meters. What is the acceleration of the car?

vi=30 m/s

vf=22 m/s

t=7 s

r=30 meters.

2. Relevant equations

change in velocity/change in time= tangential acceleration ?

centripetal acceleration = v^2/ r = -radial acceleration

a=a_radial+a_tangential(acceleration in vector notation)

3. The attempt at a solution

change in v/ change in time= (22m/s-30 m/s) / (7s)= tangential acceleration= -1.14 m/s^2

I'm not sure how to find the centripetal acceleration? Does the problem mean find the total acceleration at each point? Meaning using each v to find centripetal acceleration?

(30)^2/ 30=

(22)^2/ 30=

Maybe the difference between the two?

There's no way to check my answer.

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Centripetal and Tangential Acceleration (Change in Speed over time)

**Physics Forums | Science Articles, Homework Help, Discussion**