Part A

Calculate the impulse experienced when a $68$ kg person lands on firm ground after jumping from a height of $2\mathrm{.}6$ m $.$

Express your answer using two significant figures.

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Part B

Estimate the average force exerted on the person's feet by the ground if the landing is stiff$-$legged. With stiff legs, assume the body moves $1\mathrm{.}2$ cm during impact. $[$Hint$.$ The average net force on her which is related to impulse, is the vector sum of gravity and the force exerted by the ground.$]$

Express your answer using two significant figures.

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Part C

Estimate the average force exerted on the person's feet by the ground if the landing is with bent legs. When the legs are bent, assume the body moves about $48$ cm during impact.

Express your answer using two significant figures.

$$

$F_{\text{a}\text{v}\text{g}}=$

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