- #1
Glenboro
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1. Homework Statement
A 75.0 kg person runs at 3.00 m/s and jumps onto a sled of mass 10.0 kg already moving in the same direction as the person at 2.00 m/s.
a) What is the initial momentum of the sled-person system?
b) What will the final momentum of the sled and the person be?
c) What is the velocity of the sled and the person after the person jumps on the sled?2. Homework Equations
P = mv
Pi = Pf (when momentum is conserved)
m1vi + m2vi = m1vf + m2vf3. The Attempt at a Solution
a)P = mv
p = (75.0kg)(3.00m/s) + (10.0kg)(2.00m/s)
p = +245 kg(m/s)
The questions a) is little tricky, I am not sure if I should get momentum of being one unit (e.g 75.0 kg + 10.0kg)(3.00m/s+2.00m/s) or what I did originally
b) Pi = Pf (when momentum is conserved)
Therefore pf = 245 kg(m/s)
C) m1vi + m2vi = m1vf + m2vf
245 kg(m/s) = (75kg +10kg)(v2f)
V2f = 2.89 m/s
A 75.0 kg person runs at 3.00 m/s and jumps onto a sled of mass 10.0 kg already moving in the same direction as the person at 2.00 m/s.
a) What is the initial momentum of the sled-person system?
b) What will the final momentum of the sled and the person be?
c) What is the velocity of the sled and the person after the person jumps on the sled?2. Homework Equations
P = mv
Pi = Pf (when momentum is conserved)
m1vi + m2vi = m1vf + m2vf3. The Attempt at a Solution
a)P = mv
p = (75.0kg)(3.00m/s) + (10.0kg)(2.00m/s)
p = +245 kg(m/s)
The questions a) is little tricky, I am not sure if I should get momentum of being one unit (e.g 75.0 kg + 10.0kg)(3.00m/s+2.00m/s) or what I did originally
b) Pi = Pf (when momentum is conserved)
Therefore pf = 245 kg(m/s)
C) m1vi + m2vi = m1vf + m2vf
245 kg(m/s) = (75kg +10kg)(v2f)
V2f = 2.89 m/s