Can anybody tell me how to set up #6? I kind of understand that the acceleration is going in the other direction, but I don't know how to find the average.
Acceleration is the change in velocity (final velocity - initial velocity) divided by time. They give you the time, so you need to find the change in velocity. Be careful with signs, though: if the initial velocity (going forward) is positive, then the final velocity (rebounding in the opposite direction) will be negative. Good luck.
Well, you have a pretty big change in velocity that happened in a very short amount of time, so you can expect the acceleration to be a big (negative) number. Try submitting it. It sounds right so if you don't have the answer you probably just made a silly mistake.
4 comments:
Acceleration is the change in velocity (final velocity - initial velocity) divided by time. They give you the time, so you need to find the change in velocity. Be careful with signs, though: if the initial velocity (going forward) is positive, then the final velocity (rebounding in the opposite direction) will be negative.
Good luck.
I am still confused. This is how I set it up:
(-21.9-24.9)/.015
This just gives me a big number that doesn't seem right.
Well, you have a pretty big change in velocity that happened in a very short amount of time, so you can expect the acceleration to be a big (negative) number. Try submitting it. It sounds right so if you don't have the answer you probably just made a silly mistake.
Yep. It was right. Thanks a lot! I just didn't realize it was a big number like that.
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