Range larger during first half of flight.

[Lunasly]

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For anyone that has TPRH Science workbook, I'm talking about passage 7, #9 on pg. 61. Why is a projectiles range (distance travelled in the x-direction) larger during the first half of the projectiles flight (i.e., up to the point where the projectile reaches maximum height) relative to the distance travelled in the x-direction during the second half of the flight (right after it reaches the maximum height)?

Thanks for the help. I can't seem to grasp this concept.

 

[Teleologist]

Range, or displacement in the x-direction, should only be affected by velocity (and by extension acceleration and force) in the x-direction; velocity in the x-direction should be constant throughout the flight unless there were some external, horizontal force acting on the projectile. This rules out the Earth's gravity since its gravity acts strictly in the downward direction on the projectile. Could air resistance be involved in TPRH's description?

 

[DrknoSDN]

Would have to be air resistance.