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lettertwelve
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[SOLVED] Two carts with masses of 8.0 kg and 1.8 kg, respectively, move on a friction
Two carts with masses of 8.0 kg and 1.8 kg, respectively, move on a frictionless track with velocities of 8.0 m/s and 3.5 m/s. The carts stick together after colliding head-on. Find the final speed.
m1v1+m2v2 = v (m1 + m2)
v_final = (m1*v1 + m2*v2)/(m1+m2)
(8*8)+(1.8*3.5)=70.3
so
70.3=(8+1.8)V
which is then 70.3=9.8V
V=7.17
but it says I'm doing it wrong. (webassign problem)
please show me how i did it wrong?? or what's wrong?
Homework Statement
Two carts with masses of 8.0 kg and 1.8 kg, respectively, move on a frictionless track with velocities of 8.0 m/s and 3.5 m/s. The carts stick together after colliding head-on. Find the final speed.
Homework Equations
m1v1+m2v2 = v (m1 + m2)
v_final = (m1*v1 + m2*v2)/(m1+m2)
The Attempt at a Solution
(8*8)+(1.8*3.5)=70.3
so
70.3=(8+1.8)V
which is then 70.3=9.8V
V=7.17
but it says I'm doing it wrong. (webassign problem)
please show me how i did it wrong?? or what's wrong?