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1. A 0.30 g fly moving at 1.5 m s−1 is trapped by a spider’s web. The fly comes to rest in a time of 0.40 s. Calculate the magnitude of:
a) the change in momentum of the fly
b) the average force exerted by the web on the fly.

thanks for any help!

also if anyone could take a look at another question i'm struggling on, i'd appreciate it, thanks! it's here http://www.thestudentroom.co.uk/show....php?t=3570695
2. Calculate its initial momentum and final momentum:

Force = change in momentum over time:

3. Also, convert the mass into kilograms if you haven't already, I'm guessing they want in , not and in not

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