find the momentum of a truck of mass 2000kg which is moving with a velocity of 36 kmh^-1.
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Explanation:
Mass of Car (m) = 2000 kg.
Initial velocity of car =36km/h=
60×60
36×1000
=10m/s
Final velocity of the car, v=0km/h=0m/s
time taken = 10 s.
Change in momentum rating place in 1s is called rate of change of momentum.
So, rate of change of momentum =
Time taken
Total change in momentum
=
Time taken
Final momentum - initial momentum
Rate of change of momentum =
t
mv−mu
=
t
m(v−u)
Change in momentum in 1s =
10
2000×(0−10m/s)
=
10
2000×(−10)
kgm/s
2
=−2000N
Negative sign indicates that momentum is decreasing.
So, momentum decreases by 2000 N in 1s
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