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Four seconds after an object is thrown down with an initial velocity of 20 m/s on...

Four seconds after an object is thrown down with an initial velocity of 20 m/s on Planet X, it’s speed is 80 m/s. What is the acceleration of gravity on this planet?

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Answer #1

According to the kinematical relation
  
where, u is the initial velocity and v is the final velocity after time t and f is the acceleration.
So, given the values,
     
we get
  
  
This is the acceleration of gravity on the planet.

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