# simple physics problems help?

theses are simple physics problems that i can't figure out because i'm dumb at this! help please!

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

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

3. 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 an acceleration of 4.2m/s2 for 6.5s , after which the gazelle continues at a steady speed. A human would win a very short race with a gazelle. The best time for a 30 m sprint for a human runner is 3.6 s. How much time would the gazelle take for 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 already did about 17 problems so don/t worry! 🙂

• 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

• Gannet Sea Bird

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