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BobbyJones

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Aug 15, 2011
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I have a question thats says "A projectile of 2kg changes direction in the following way. Calculate the magnitude and direction of the change in momentum and direction.

Initial velocity final velocity
110 m/s 104 m/s
------> ------>

Which formulas should I use here, should I look at the momentum one and add them together. The direction is going the same way, but if I use the formula ucos(theta) = 110cos0, theta will be zero due to it pointing east, therefore the answer would be zero which looks wrong?

Is the mass a red herrin? or do I need that infomation somewhere?

Help point me in the right direction please.
 
BobbyJones said:
I cant believe this question has stumped everyone!
Click to expand...

If you re-read your original post - you'll find that it absolutly does not make sense.

I did not care to waste my time to extract the correct problem statement (and accompanying sketch from you).
 
BobbyJones said:
I have a question thats says "A projectile of 2kg changes direction in the following way. Calculate the magnitude and direction of the change in momentum and direction.

Initial velocity final velocity
110 m/s 104 m/s
------> ------>

Which formulas should I use here, should I look at the momentum one and add them together. The direction is going the same way, but if I use the formula ucos(theta) = 110cos0, theta will be zero due to it pointing east, therefore the answer would be zero which looks wrong?

Is the mass a red herrin? or do I need that infomation somewhere?

Help point me in the right direction please.
Click to expand...

p=mv
deltap=m*deltav
(104-110)*2= -12 kgm/s

it has turned to negative direction
 
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