How Does Projectile Motion Affect a Soccer Ball's Velocity After 0.50 Seconds?

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Homework Statement


A soccer ball is kicked so it follows the path of a projectile. It is given an initial velocity of 7.5 m/s at an angle of 25 degrees to the horizontal as it leavest he ground. What is the velocity of the ball 0.50 seconds after the ball leaves the ground?


Homework Equations


V=Vo + (a)(t)


The Attempt at a Solution


no clue
 
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Find the horizontal and vertical components of velocity. Horizontal velocity remains constant. Find the vertical velocity after time t using the relevant equation given by you. Finally find the resultant velocity by using vector method.
 
The book claims the answer is that all the magnitudes are the same because "the gravitational force on the penguin is the same". I'm having trouble understanding this. I thought the buoyant force was equal to the weight of the fluid displaced. Weight depends on mass which depends on density. Therefore, due to the differing densities the buoyant force will be different in each case? Is this incorrect?

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