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(Solved): A rock of mass 50 g is thrown upward with an initial speed of 25 m/s. Find the work done by the forc ...


A rock of mass 50 g is thrown upward with an initial speed of 25 m/s. Find the work done by the force of gravity on the rock from the time it leaves the thrower's hand until it reaches the highest point of its trajectory. hint: you do not have to calculate the rock's maximum height.



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Hello champ, lets solve this question.

This question can be solved by using the formula of kinetic energy. That is :
  
where KE is kinetic energy
m is mass
and v is velocity.

Given values :
mass of rock (m)=50 g
Convert it into kg.
1 kg= 1000 grams.
So, 50 g = 0.05 Kg
m = 0.05 kg
initial speed(v)=25 m/s.


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