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21 votes
A stunt man jumps from a burning building and comes to

rest at ground level. Consider his impulse during landing if
he lands on a soft mat, on a concrete surface, or in a safety
net. Which of the following is true?
a. His impulse is greatest if he lands on a soft mat.
b. His impulse is greatest if he lands on a concrete
surface.
c. His impulse is greatest if he lands in a safety net.
d. The impulse is the same in all three cases.
e. There is zero impulse in all three cases because he
comes to rest.

User Brisbe
by
4.0k points

2 Answers

6 votes

Final answer:

The impulse experienced by the stunt man when landing is the same regardless of whether he lands on a soft mat, a concrete surface, or in a safety net since it is equal to the change in momentum, which is the same in each scenario. However, the force felt would be less with a soft mat or safety net due to the increased duration of the impact.

Step-by-step explanation:

The impulse experienced by a stunt man during landing is independent of the nature of the surface he lands on. According to the concept of impulse in physics, impulse is defined as the change in momentum of an object when a force is applied over a period of time, and is given by the equation Impulse (J) = Change in Momentum (ΔP). The stunt man's momentum changes from whatever value it was before he hit the ground to zero (since he comes to rest), regardless of whether he lands on a soft mat, a concrete surface, or in a safety net. Therefore, the impulse is the same in all three scenarios. However, it's important to note that while the impulse is the same, the force exerted over time would differ. A soft mat or safety net would increase the duration of the impact, thereby reducing the effect of the force experienced by the stunt man, in accordance with the concept that a longer collision time means a lesser force.

User Bathyscapher
by
3.9k points
4 votes

Answer:

I think it's E it just sounds right to me tbh

Step-by-step explanation:

User Agent Biscutt
by
4.4k points