B
booboo
Guest
A car starts from rest and travels for 5.0s with a uniform acceleration of +1.5 m/s^2. The driver then applies the brakes, causing a uniform acceleration of -2.0 m/s^2. if the brakes are applied for 3.0s, (a) how fast is the car going at the end of the braking period, and (b) how far has the car gone?
I asked this about an hour ago and got some really great answers. The only thing that I don't understand, though, is why, when I'm finding the negative acceleration, do I have to square time? I didn't have to square it when I was finding the positive acc, so I don't get why I have to with the neg. 32.25 meters is the correct answer, but I really want to understand this. Thanks in advance for your help!
I asked this about an hour ago and got some really great answers. The only thing that I don't understand, though, is why, when I'm finding the negative acceleration, do I have to square time? I didn't have to square it when I was finding the positive acc, so I don't get why I have to with the neg. 32.25 meters is the correct answer, but I really want to understand this. Thanks in advance for your help!