- #1

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## Homework Equations

## The Attempt at a Solution

I used m1Vi + m2Vi = (m1+ m2) Vf

to find Vf = 0.1 m/s

I know F= k x

I dunno know how you would find F.

Please help

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- Thread starter sr57
- Start date

- #1

- 7

- 0

I used m1Vi + m2Vi = (m1+ m2) Vf

to find Vf = 0.1 m/s

I know F= k x

I dunno know how you would find F.

Please help

- #2

- 737

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- #3

- 231

- 1

(0.2 kg)*(0 m/s) + (0.05 kg)*(0.1 m/s) = (0.25 kg)*v_f

v_f = 0.02 m/s

Although the collision between the dart and the block is inelastic, the compression of a spring does conserve the sum of the kinetic energy and the elastic potential energy!

- #4

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Since F= PV => F = (mv)v ==> F= 0.25

F= kx

0.25/25 N/m = x

x= 0.01 m

- #5

- 737

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Why do you say F = pv?

- #6

- 231

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It's important to see here that the sum of elastic potential energy and kinetic energy is conserved. So what is the elastic potential energy of a spring compressed distance x?

- #7

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Sorry I meant P = Fv therefore F = P/V and since P=mv, F = mv/v = m ?

- #8

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Whoa, you've just said F=mv/v = m.... But force isn't equal to mass!

- #9

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It's important to see here that the sum of elastic potential energy and kinetic energy is conserved. So what is the elastic potential energy of a spring compressed distance x?

So 1/2 mv^2 = 1/2 kx^2

x = 0.01 m

- #10

- 231

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Can you show your substitution? There seems to be a mistake there.

- #11

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x^2 = 0.002 m

I put the answer for the rong question before..sorry abt that :$

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