- #1

- 9

- 0

the 1st question of this problem ask: How long is the bullet in the target?

I simply do:

40.0cm=0.4m ; 0.4m/(900m/s)=4.4*10^-4

The answer shows 4.0*10^-4

Did I make a mistake or it is just a rounding problem?

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- Thread starter ZzZerozZ
- Start date

- #1

- 9

- 0

the 1st question of this problem ask: How long is the bullet in the target?

I simply do:

40.0cm=0.4m ; 0.4m/(900m/s)=4.4*10^-4

The answer shows 4.0*10^-4

Did I make a mistake or it is just a rounding problem?

- #2

tiny-tim

Science Advisor

Homework Helper

- 25,832

- 251

Hi ZzZerozZ! Welcome to PF!

i] in your distance/speed, you've used the width of the block as the distance, but the block is

ii] your speed is the

- #3

- 39

- 0

the 1st question of this problem ask: How long is the bullet in the target?

I simply do:

40.0cm=0.4m ; 0.4m/(900m/s)=4.4*10^-4

The answer shows 4.0*10^-4

Did I make a mistake or it is just a rounding problem?

Using s = (u+v)/2 *t the answer is 4 *10^-4. s= distance, u = inital vel, v= final vel.

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