. Find
the power if the opposing frictional force is 100 N. Now, suppose after
travelling a distance of 200 m, this car collides with another stationary car B
of same mass and comes to rest.
Let its engine also stop at the same time. Now car B
starts moving on the same level road without getting its engine started. Find
the speed of the car B just after the collision.
Answer:
Given, mass of car (A) = 1000 kg
Mass of car 6 =1000 kg
Force applied by car A = 100 N
Speed
of car
Power
of car 
[F = force exerted by the car
against
friction]
Again, for car (A) Newton's law, F = ma
Velocity of car A after travelling 200 m is given by
From third equation of motion, 
[for car A here, 
]
According to the question, after moving of 200 m, the
speed of car A,
Just
after the collision, the final speed of car 
before collision,
the initial speed of car 
From
conservation of linear momentum,
[Let just after the collision, the speed of the car B is
] 
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