- #1
DrMcDreamy
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This is a two part problem, but once I figure out one part I can do the other.
a) A(n) 67.5 g object moving to the right at 26.7 cm/s overtakes and collides elastically with a(n) 18.8 g object moving in the same direction at 17.952 cm/s. Find the velocity of the first object immediately after the collision. Answer in units of cm/s.
b) Find the velocity of the second object immediately after the collision. Answer in units of cm/s.
1) m1(v1i-v1f) = m2(v2f-v2i)
2) v1i+v1f = v2f+v2i
1) (67.5 g)(26.7 cm/s - v1f) = (18.8 g)(v2f - 17.952 cm/s)
2) 26.7 cm/s + v1f = v2f +17.953 cm/s
(65.7g)(26.7cm/s) + 26.7cm/s = 18.8gv2f
97.3 cm/s = v2f
26.7 cm/s + v1f = 97.3 cm/s + 17.952 cm/s
v1f = 88.6 cm/s
Its wrong and I think my problem is somewhere in the math, I think I am messing up the calculations. Where am I wrong?
Homework Statement
a) A(n) 67.5 g object moving to the right at 26.7 cm/s overtakes and collides elastically with a(n) 18.8 g object moving in the same direction at 17.952 cm/s. Find the velocity of the first object immediately after the collision. Answer in units of cm/s.
b) Find the velocity of the second object immediately after the collision. Answer in units of cm/s.
Homework Equations
1) m1(v1i-v1f) = m2(v2f-v2i)
2) v1i+v1f = v2f+v2i
The Attempt at a Solution
1) (67.5 g)(26.7 cm/s - v1f) = (18.8 g)(v2f - 17.952 cm/s)
2) 26.7 cm/s + v1f = v2f +17.953 cm/s
(65.7g)(26.7cm/s) + 26.7cm/s = 18.8gv2f
97.3 cm/s = v2f
26.7 cm/s + v1f = 97.3 cm/s + 17.952 cm/s
v1f = 88.6 cm/s
Its wrong and I think my problem is somewhere in the math, I think I am messing up the calculations. Where am I wrong?
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