Question

A snowmobile has an initial velocity of 3.0 m/s

Part 1: If it accelerates at the rate of 0.5 m/s/s for 7.0 sec, what is the final vel.?
Part 2: If it accelerates at the rate of -0.60m/s/s, how long will it take to reach a complete stop?


**for part 1, is this how you do it? final velocity=3+0.5*7=3+3.5=6.5 m/s ?

and not sure at all for part 2! :/ @phi @Michele_Laino what do y'all think? :) thank you!!

Answer 1

please, note that for part 1, you have to apply the same formula used before, namely
\[v(t)=v _{0}+a*t\]

Answer 2

yes:) did i do that right?

v0=3.0 + 0.5 * 7.0 = 3.0 + 3.5 = 6.5 m/s final velocity?

Answer 3

ok!

Answer 4

for part 2, you have to apply this formula:
\[0=v _{0}-a*t\]
where v_0=6.5 and a=0.6, so we have:
\[0=6.5-0.6*t\]
please solve for t

Answer 5

ah okay, so then we get 0=5.9*t

t= - 5.9 ?

Answer 6

it will be negative?

Answer 7

no, please note that t is time!

Answer 8

oh! so t will be 5.9 seconds?

Answer 9

sorry, my equation is:
\[0=6.5-(0.6*t)\]

Answer 10

so it will be 0=6.5-0.6t

0.6t=6.5
t=10.83 ?

Answer 11

that's right!

Answer 12

oh yay!! thank you so much!! :)

Answer 13

thank you! :)