- #1
HeavyGuy
- 5
- 0
Homework Statement
An arrow slows down from 43 m/s to 28 m/s as it passes through an apple. If the 493-g apple was originally at rest and sped up to 0.44 m/s, what is the mass of the arrow
Vapple,i = 0 m/s
Vapple,f = 0.44 m/s
Varrow,i = 43 m/s
Varrow,f = 28 m/s
m,apple = o.493 kg
m,arrow = ?
Homework Equations
im guessing we only need Eki = Ekf which is 1/2mvi(ar)^2 + 1/2mvi(ap)^2 + 1/2mvf(ar)^2 + 1/2mvf(ap)^2
The Attempt at a Solution
i plugged it all into the equation so it looks like this near the end
924.5m = 0.0477224 + 392m
i then subtracted the 392 from 924.5 and divided that number by the long decimal to solve for m, but answer was totally off. can anyone tell me where i went wrong? thanks