- #1

- 22

- 0

the problem is:

A rubber-band slingshot shoots a 25-gstone. What is the initial speed of the stone if the rubberband is drawnback 0.15m with aforce of 27 N?

m= 25g

d=0.15 m

f= 27 N

v(initial) = ?

Ep = (1/2)Fx

Ek=(1/2) mv^2

so far, I turned the forceto energy: (27N)(0.15m)= 4.05J

and then solved for v, using Ek= (1/2)mv^2

and I get v=5.69

Im so confused, this answer deffinetly does not seem right..

Im just not sure what to do with the given force here!, do I turn it into work ? (w=fd)

I've been stuck on this question for two days now,i just dont understand how any of the givens can tie in with the energy formulas..?

A rubber-band slingshot shoots a 25-gstone. What is the initial speed of the stone if the rubberband is drawnback 0.15m with aforce of 27 N?

m= 25g

d=0.15 m

f= 27 N

v(initial) = ?

## Homework Equations

Ep = (1/2)Fx

Ek=(1/2) mv^2

## The Attempt at a Solution

so far, I turned the forceto energy: (27N)(0.15m)= 4.05J

and then solved for v, using Ek= (1/2)mv^2

and I get v=5.69

Im so confused, this answer deffinetly does not seem right..

Im just not sure what to do with the given force here!, do I turn it into work ? (w=fd)

I've been stuck on this question for two days now,i just dont understand how any of the givens can tie in with the energy formulas..?

Last edited: