A piece of wood with a mass of is dropped from the top of a high building. At the same time, a ball with a mass of is thrown vertically upwards from the ground at a speed of The balls are driven into the wood. Then the maximum height that the combined system can reach above the top of the building before falling is .
10 m
30 m
20 m
40 m
Suppose the two collide at point P after time t. Time for particles to collide,
Speed of wood before impact
Speed of bullet before impact
The before condition was :
After collision
Now conservation of linear momentum before and after collision:
The maximum height reached by the object
Now let h is the hight above ground when two meet before impact
Or,
Or,
Height above tower == 40 m
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