Constant Acceleration

**jkeatin** · July 21st 2008, 02:17 PM

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

**Chris L T521** · July 22nd 2008, 11:39 AM

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!

--Chris

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