(a) Explanation Given: Initial velocity ( u ) = 0 m / s Height ( h ) = 18 m Acceleration ( a ) = 9.8 m / s 2 Formula Used: Third equation of motion: v 2 − u 2 = 2 a s Where, v is the final velocity, u is the initial velocity, a is the acceleration and s is the displacement. Calculations: Here, s = h v 2 = u 2 + 2 g h v 2 = 0 + 2 × 9.8 × 18 v = 2 × 9.8 × 18 v = 18.78 m / s The average deceleration of person after making contact with the safety net. Before making contact with safety net, person velocity is v = 18 (b) To determine Whether the net should be tightened or loosened for smaller deceleration.

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ISBN: 9780321921741

Author: GIANCOLI

Publisher: PEARSON

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Chapter 2, Problem 62GP

(a)

To determine

The average deceleration of person when she is jumping into firefighter’s safety net.

(b)

To determine

Whether the net should be tightened or loosened for smaller deceleration.

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Chapter 2, Problem 61GP

Chapter 2, Problem 63GP

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