simple physics problems help?

Question

These are simple physics problems that I can't figure out because I'm struggling with this topic! I would appreciate your help.

A gannet is a seabird that fishes by diving from a great height. If a gannet hits the water at a speed of 32 m/s, what height did it dive from? Assume that the gannet was motionless before starting its dive.

A football is kicked straight up into the air and hits the ground 4.6 seconds later. What was the greatest height reached by the ball? Assume it is kicked from ground level.

A Thomson's gazelle can run at very high speeds, but its acceleration is relatively modest. A reasonable model for the sprint of a gazelle assumes it has an acceleration of 4.2 m/s² for 6.5 seconds, after which it continues at a steady speed. A human would win a very short race against a gazelle. The best time for a human runner to complete a 30 m sprint is 3.6 seconds. How much time would it take the gazelle to finish a 30 m race?

Thank you, and please explain as much as you can! I'm not trying to get you to do my homework; I've already completed about 17 problems, so don’t worry! 😊

Anonymous · Accepted Answer

1. with all kinematic problems, you want to label your known variables

(delta)x= ?

a= -9.8 m/s^2

u= 0 m/s

v= 32 m/s

t= ?

use v^2= u^2 + 2a(delta)x

32^2= 0 + 2(-9.8)(delta x)

delta x = -52 m ------> height is 52 m

sorry, i am not sure about 2 and 3- im learning all this at the moment as well

Maci Larkin · Answer

Gannet Sea Bird

Anonymous

simple physics problems help?

2 Answers

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