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Soccer - What was the impulse on the soccer ball

  • Thread starter gansta344u
  • Start date
1. Homework Statement
A 0.40 kg soccer ball approaches a player
horizontally with a velocity of 18 m/s to the
north. The player strikes the ball and causes
it to move in the opposite direction with a
velocity of 24 m/s.
What impulse was delivered to the ball by
the player? Answer in units of kg · m/s.

2. Homework Equations
M(v)f-M(v)i=impulse

3. The Attempt at a Solution
i did (.4kg)(24m/s)-(.4kg)(18m/s) and i got it wrong so if u can please help
 

LowlyPion

Homework Helper
3,079
4
Re: Momentum

1. Homework Statement
A 0.40 kg soccer ball approaches a player
horizontally with a velocity of 18 m/s to the
north. The player strikes the ball and causes
it to move in the opposite direction with a
velocity of 24 m/s.
What impulse was delivered to the ball by
the player? Answer in units of kg · m/s.

2. Homework Equations
M(v)f-M(v)i=impulse

3. The Attempt at a Solution
i did (.4kg)(24m/s)-(.4kg)(18m/s) and i got it wrong so if u can please help


The key here is direction.

If it comes in at 18m/s and reverses then it returns at -24m/s.

-24 - 18 = -42
 
1,100
0
Re: Momentum

The key to this is directions. Choose one and then all velocities are either positive or negative relative to that. Does that help?

The Bob

P.S. It's not my night; second after post, apologies once again.
 
Last edited:

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