Constant Acceleration

• July 21st 2008, 02:17 PM
jkeatin
Constant Acceleration
What constant acceleration is required to increase the speed of a car from 30 mi/hr to 50 mi/hr in 5 seconds?
• July 22nd 2008, 11:39 AM
Chris L T521
Quote:

Originally Posted by jkeatin
What constant acceleration is required to increase the speed of a car from 30 mi/hr to 50 mi/hr in 5 seconds?

Since $v_f=50\frac{\text{mi}}{\text{hr}}$ and $v_i=30\frac{\text{mi}}{\text{hr}}$, then

$a=\frac{\Delta v}{\Delta t}=\frac{50\frac{\text{mi}}{\text{hr}}-30\frac{\text{mi}}{\text{hr}}}{5\text{ sec}-0\text{ sec}}\approx {\color{red}\boxed{0.001\frac{\text{mi}}{\text{s}^ 2}}}\approx \color{red}\boxed{1.788\frac{\text{m}}{\text{s}^2} }$

I hope that this makes sense! :D

--Chris