A snowmobile has an initial velocity of +4.0?
Posted on Oct 29, 2009 under snowmobile parts |A snowmobile has an initial velocity of +4.0
m/s.
a) If it accelerates at the rate of +0.40 m/s2
for 7.0 s, what is the final velocity?
Answer in units of m/s.
004 (part 2 of 2) 10.0 points
b) If instead it accelerates at the rate of −0.20
m/s2, how long will it take to reach a complete
stop?
Answer in units of s.
Use the same formula for both parts and plug in the numbers - and pay attention in class! 
Answer to Part a:
a = [v(f) - v(i)]/t
0.4 = [v(f) - 4] / 7
solving for v(f)
v(f) = (7 x 0.4) + 4
v(f) = 6.8 m/s
Answer to part b: (substitute to same formula as other questions that I answered)
d = 4(7) + 1/2 (-0.2)^2
d = 28+ 1/2(0.04)
d = 28.02 m
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By Retsum on Oct 30, 2009 | Reply
a) v = u + at = 4.0 + 0.40 x 7.0 = 6.8 m/s
b) v = u + at
0 = 4.0 - 0.20t
t = 4.0/0.20 = 20 s
References :
By Mustafa K on Oct 30, 2009 | Reply
Use the same formula for both parts and plug in the numbers - and pay attention in class!
Answer to Part a:
a = [v(f) - v(i)]/t
0.4 = [v(f) - 4] / 7
solving for v(f)
v(f) = (7 x 0.4) + 4
v(f) = 6.8 m/s
Answer to part b: (substitute to same formula as other questions that I answered)
d = 4(7) + 1/2 (-0.2)^2
d = 28+ 1/2(0.04)
d = 28.02 m
References :