The jumper has a mass of 50 kg, and the bridge's height above the river is 150 m. The rope has an unstretched length of 11 m and
1 answer:
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Answer:
When the net external force is zero
Explanation:
We can answer to this question by referring to Newton's Second Law, which can be written in the following form
where
F is the net external force acting on a system
is the change in momentum of the system
is the time interval
When the total momentum of a system is conserved (so, it does not change), its variation is zero:
In order to satisfy this condition, we see from the formula that we must also have
F = 0
so the net external force acting on the system must be zero.