a trcuk weighs four times as much as a stationary car. if teh truck coasts into the car at 12 km/s and they stick toegther, what
is their final velocity
1 answer:
Answer:
v=9.6 km/s
Explanation:
Given that
The mass of the car = m
The mass of the truck = 4 m
The velocity of the truck ,u= 12 km/s
The final velocity when they stick = v
If there is no any external force on the system then the total linear momentum of the system will be conserve.
Pi = Pf
m x 0 + 4 m x 12 = (m + 4 m) x v
0 + 48 m = 5 m v
5 v = 48
v=9.6 km/s
Therefore the final velocity will be 9.6 km/s.
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Answer:
20.58 kJ
Explanation:
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height, h = 28 m
Work = m x g x h
W = 75 x 9.8 x 28
W = 20580 J
W = 20.58 kJ
Thus, the work done is 20.58 kJ.
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