A 640-N acrobat falls 5.0 m from rest into a net.The net tosses him back up with the same speed he had just before he hit the net.The average upward force exerted on him by the net during this collision is:
A)32 N
B)64 N
C)320 N
D)640 N
E)impossible to determine from given data

Question

Quizplus · Accepted Answer

The average upward force exerted on the acrobat by the net cannot be determined with the given information because the time duration of the collision (or interaction with the net) is not provided. The force can be calculated using the impulse-momentum theorem if the time of interaction is known, but without it, we cannot calculate the force.

A 640-N Acrobat Falls 5