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Physics Question?
A ball rolls up an inclined plane at an initial velocity of 4.0 m/s five seconds it is revelling down the hill at 9.0 m/s, what is the ball's acceleration…assume it starts from bottom. Also can you explain why the direction needs to be kept the same?
1 Answer
- ?Lv 66 years agoFavorite Answer
So the ball is moving at 4 m/s up wards, and after 5 seconds 9m/s down.
So the TOTAL change in it's velocity is!! +4 that way>> then 9<< that way, it's velocity changed by 13m/s!
We have one vital piece of information!!
Change in velocity is 13!!
Another vital pece of information is that this change happens over a time of 5 seconds!
and wala, we have the information needed,to use the formula acceleration=change in velocity/time = 13m/s / 5seconds = 13/5 (2.6 m/s^2)
Even though it is innitially moving up there is always a force pulling and accelerating it back down, even if it's moving upwards, the fact that it's slowing down whilst moving up is it's acceleration downwards. So the acceleration is always down the slope..!!
