Question

Algerbra 1.
p.129 #17 PHIYSIS accceleration is the measure of how fast a velocity is changing. The formula foracceleration is a=vf-vi over t. a represents the acceleration rate, vf is the final velocity, vi is the intial velocity, and t represents the time in seconds.
a. solve the fomula for vf.
i got a*t+vi=vf
b. What is the final velocity of a runner who is accelerating at 2 feel per second squared for three seconds with an initial velocity of 4 feet per second?

What do i do and is the top answer right!??

Answer 1

\[v _{f}=4+2(3)\]

Answer 2

@Chlorophyll can u help me with this?

or anyone else who is willlign to help (:

Answer 3

convert answer from feet to metres

Answer 4

@Jonask how did u get there??!

Answer 5

\[v _{f}=v _{i}+at\]

Answer 6

\[v _{i}=4,a=2,t=3\]

Answer 7

a. solve the fomula for vf.
a = ( vf -vi ) t.
->at = vf -vi
=>vf = at + vi

Answer 8

so you substitute this values

Answer 9

@smile.im.here. clear enough?

Answer 10

@Chlorophyll that's bacily wat i got for a. but what am i suposed to do for b.?

Answer 11

b. What is the final velocity, vf :
Given a = 2 ft/sec² t =3 secs, vi = 4 ft/sec

Answer 12

=>vf = vi + a t
All you do is to plug the numbers in to get vf.

Answer 13

yeah..i like algerbra and all but i cant read it. so this is just a gues..

Answer 14

\[v _{_{f}}=4+2^{3}\]
wud that be right?

Answer 15

and @Chlorophyll yes i meant 'guess'

Answer 16

what? "can't read"?

Answer 17

OHHH!! yeah! no, i dont really understand it if im not in the room with the teacher. heh..

Answer 18

Now just match the numbers with the letters properly:
vf = vi + a* t
vi = 4 ft/sec
a = 2 ft/sec²
t =3 secs,

Answer 19

so wud the equation i put up be correct? and then just solve for the final velocity, right?

Answer 20

YAY!

Answer 21

tks (:

Answer 22

just a second.

Answer 23

do i combine 4ft/sec and 2ft/sec? and then divide by three?

Answer 24

vf = vi + a* t ( vi = 4 ft/sec, a = 2 ft/sec², t =3 secs)
= 4 + 2 * 3
There's no divide at all!

Answer 25

but...ohh, i think my brain wants to move a variable. ok
4+2=6*3=18. i think. im not very good at this stuff

Answer 26

vf = vi + a* t ( vi = 4 ft/sec, a = 2 ft/sec², t =3 secs)
= 4 + ( 2 * 3 )
Always multiply first!

Answer 27

oh so then vf=10

Answer 28

i told u i was not great at this stufff (:

Answer 29

Good luck with your algebra study, then :)

Answer 30

oh yess i know and we have eca's this year. fun

Answer 31

and thanks for helping :D