Projectile Launch Speed: Solve 876j Work Homework

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To find the launch speed of a projectile given 876 joules of work on a 0.398 kg projectile, the work-energy principle can be applied, stating that work done is equal to the change in kinetic energy (W = ΔE). The gravitational force acting on the projectile is approximately 3.9004 N. The user is struggling with the calculations and has attempted to draw a diagram to visualize the problem. They acknowledge that the work done translates entirely into kinetic energy. Further assistance is requested to solve for the launch speed.
Chica1975
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Homework Statement


A projectile launcher did 876j of work on a .398kg projectile what is the launch speed of the projectile?


Homework Equations


W = f*d
mg = 3.9004
after that I am stuck


The Attempt at a Solution



I drew a diagram and tried a few things but am completely stuck. please help.
 
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Chica1975 said:

The Attempt at a Solution



I drew a diagram and tried a few things but am completely stuck. please help.

The work done is entirely kinetic :wink:
 
thanks I will look it up and try again.
 
W = F * d is only a mathematical tool to calculate how much work is done. The applicable statement of physics is W = \DeltaE
 
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