A parachutist bails out and freely falls 61 m. Then the parachute opens, and thereafter she decelerates at 2.1 m/s2. She reaches the ground with a speed of 2.5 m/s. (a) How long is the parachutist in the air? (

A parachutist bails out and freely falls 61 m. Then the parachute opens, and thereafter she decelerates at 2.1 m/s2. She reaches the ground with a speed of 2.5 m/s. (a) How long is the parachutist in the air? (

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter3: Motion In Two Dimensions

Section: Chapter Questions

Problem 10P

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Concept explainers

Relative Velocity

It is a measurement of an object with regards to the other object which is moving or stable or stationary. For example, if we are traveling in a bus and the bus is moving at speed of 50km/hr, then our speed is according to the nearby passenger on the bus is zero. According to them, we are not moving. But if one person standing on the ground or road observes us from outside of the bus, according to him we are moving at a speed of 50km/hr and the bus is also moving at a speed of 50km/hr. Now, the motion is recognized by the observer, it depends on a frame of reference or observer. This is motion called relative motion.

Question

A parachutist
bails out and freely falls 61 m. Then
the parachute opens, and thereafter she
decelerates at 2.1 m/s2. She reaches the ground
with a speed of 2.5 m/s. (a) How long is the
parachutist in the air? (b)
fall begin?

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