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M1: Impulses watch

1. I know that I=mv-mu but what happens when the particle is accelerating?
Any input would be appreciated.
2. (Original post by tessa.lin)

I know that I=mv-mu but what happens when the particle is accelerating?
Any input would be appreciated.
do you mean in this example?
3. (Original post by TeeEm)
do you mean in this example?
Yes
4. (Original post by tessa.lin)
Yes
Collision are assumed to be instantaneous ...
in this problem you are only concerned with the speed just before impact and the spreed just after.

What happened prior to that moment and right afterwards is irrelevant
5. (Original post by TeeEm)
Collision are assumed to be instantaneous ...
in this problem you are only concerned with the speed just before impact and the spreed just after.

What happened prior to that moment and right afterwards is irrelevant
So i do not use i=mv-mu to work out the answer? If so how do i go about solving this? I might just be being a bit silly right now.
6. (Original post by tessa.lin)
So i do not use i=mv-mu to work out the answer? If so how do i go about solving this? I might just be being a bit silly right now.
to be continued in the morning ....
7. (Original post by tessa.lin)
So i do not use i=mv-mu to work out the answer? If so how do i go about solving this? I might just be being a bit silly right now.
is the correct equation for Impulse.

You are given the speed that it hits the ground as 4m/s, the speed it bounces back as 3m/s and the mass as 0.2kg.

Don't overthink it
8. (Original post by tessa.lin)
So i do not use i=mv-mu to work out the answer? If so how do i go about solving this? I might just be being a bit silly right now.
Nah, acceleration doesn't matter here. Just use I=mv-mu and you'll get the correct impulse.

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