   Chapter 2, Problem 70AP

Chapter
Section
Textbook Problem

In Bosnia, the ultimate test of a young nun’s courage used to be to jump off a 400-year-old bridge (destroyed in 1993; rebuilt in 2004) into the River Neretva, 23 m below the bridge. (a) How long did the jump last? (b) How fan was the jumper traveling upon impact with the river? (c) If the speed of sound in air is 340 m/s, how long after the jumper took off did a spectator on the bridge hear the splash?

(a)

To determine
The time till the jump lasts.

Explanation

Given Info:

The acceleration of the jumper is 9.80m/s2

The displacement of the jumper is 23m

The formula used to calculate the time till the jump lasts is,

t=2Δya

• Δy is the displacement of the jumper
• t is the time till the jump lasts
• a is the acceleration of the jumper

Substitute 9

(b)

To determine
The velocity of the jumper at the impact.

(c)

To determine
The total time elapsed.

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