A track star in the broad jump goes into the jump at 12 m/s and launches himself at 20° above the horizontal. How long is he in the air before returning to Earth? (g= 9.8 m/s²) a. 0.42s b. 0.84s c. 1.25 s d. 1.68 s

A track star in the broad jump goes into the jump at 12 m/s and launches himself at 20° above the horizontal. How long is he in the air before returning to Earth? (g= 9.8 m/s²) a. 0.42s b. 0.84s c. 1.25 s d. 1.68 s

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter28: Special Relativity

Section: Chapter Questions

Problem 13PE: How fast would a 6.0 m-long sports car have to be going past you in order for it to appear only 5.5...

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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 track star in the broad jump goes into the jump at 12 m/s and launches himself at 20° above the
horizontal. How long is he in the air before returning to Earth? (g = 9.8 m/s²)
a. 0.42s
b. 0.84s
c.
1.25 s
d. 1.68 s

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