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Work and Kenetic Energy

1. A 4.00 kg block is traveling 15.0 m/s. (a) How fast is the block traveling if 2.00 x 10^2 J of work is done on the block? (b) If -2.00 x 10^2 of work is done on the block instead, what would be the final speed?



2. Homework Equations
KE = 1/2mv^2



3. The Attempt at a Solution
a KE = 4.5 x 10^2 + 2.0 x 10^2
b 4.5 x 10^2 J - 2.0 X 10^2
 

Answers and Replies

G01
Homework Helper
Gold Member
2,649
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What is your question?

Also, the Advanced Physics forum is more for problems from upper level undergraduate (300-400 level) physics course. Please post problems like these in the Intro Physics Forum.
 
Well I got the question wrong with the work that I did, so I waned to know what I did wrong.
 
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