# Find the average force of a golf club on a golf ball

## Homework Statement

A golf ball is struck by a golf club and sent flying down range at an angle of 30 degrees to the ground and lands 150m downrange. If the mass of the ball is 0.045 kg and the collision of the ball and club lasted 0.01s, what was the average force applied by the club?

## The Attempt at a Solution

So this is an imperfect inelastic collision? I can find the velocity of the ball after being struck but am unsure how that will help me

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Orodruin
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It does not matter what type of collision it is. You are only asked for the average force. How does the force relate to the velocity of the ball after the hit?

haruspex
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How does the force relate to the velocity of the ball after the hit?
... force and time for which it is applied ...

Orodruin
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... force and time for which it is applied ...
Well, obviously. I expected the OP to do this bit of thinking for himself.

Fnet=m*a/t?
=(0.045kg*5.66m/s/s)/.01s
=25.49N?
Or is it
Fnet=m*v/t
(0.045kg*41.22m/s)/0.01s
=185.493 N

Since impulse is change in momentum then it should be using velocity and not acceleration, no?
So the average force is 185.5N?

Orodruin
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Since impulse is change in momentum then it should be using velocity and not acceleration, no?
So the average force is 185.5N?
Yes. Using acceleration you do not even get the correct units.

Well, obviously. I expected the OP to do this bit of thinking for himself.
Big mistake to assume the obvious !!!
The answer is 'obvious' when you know it

haruspex
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Big mistake to assume the obvious !!!
The answer is 'obvious' when you know it
Orodruin was saying it should have been obvious to me that he was leaving it to jrlinton to figure out that time was the other factor.
I had chipped in because it is also true that force and distance for which it is applied leads to the velocity if the force profile is known. Average force won't do that, though.

Orodruin was saying it should have been obvious to me that he was leaving it to jrlinton to figure out that time was the other factor.
I had chipped in because it is also true that force and distance for which it is applied leads to the velocity if the force profile is known. Average force won't do that, though.
Ah...OK... I did not realise there was some understanding between your good self, Orodruin and jrlinton.
Nevertheless stating that something is 'obvious' in a post where someone needs help seems negative to me.