Intro to Impulse Video Lessons

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Problem: A boy of mass 64.7 kg is rescued from a hotel fire by leaping into a firefighters' net. The window from which he leaped was 8.9 m above the net. The firefighters lower their arms as he lands in the net so that he is brought to a complete stop in a time of 0.40 s. Ignore air resistance.What is the impulse on the net due to the boy during the interval (magnitude and direction)?

FREE Expert Solution

We'll use the kinematic equation:

vf2=v02+2as

In this problem:

The initial velocity, v0 = 0

Impulse = change in momentum.

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Problem Details
A boy of mass 64.7 kg is rescued from a hotel fire by leaping into a firefighters' net. The window from which he leaped was 8.9 m above the net. The firefighters lower their arms as he lands in the net so that he is brought to a complete stop in a time of 0.40 s. Ignore air resistance.

What is the impulse on the net due to the boy during the interval (magnitude and direction)?

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