A 1000 kg automobile is moving along a straight high way at 10 ms-1. Another car with mass 2000 kg
and speed 20 ms-l is 30 m ahead of first. Then velocity of CM is
[ ]
2) 142 ms-1
b) 15 ms-1
c) 18.5 ms-1
d) 16.7 ms -1
Answers
Answered by
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Momentum of the car - A$ = M
A
V
A
P
A
=(1000)10=10
4
kg m/s
Momentum of car -B=M
B
V
B
P
B
=(2000)(−20)=
2
−8
×10
4
kg m/s
Total momentum =P
A
P
B
=−3×10
4
kg m/s
Velocity of COM=
M
A
M
B
M
A
V
A
+M
B
M
B
V
COM
=
1000+2000
(10)(1000)−(20)(2000)
V
COM
=−10 m/s
Total momentum=M
ssyste ×V COM
=3000×−10=−3×10 ^4 kg m/s
Hence compared
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