Answer to Question #176647 in Physics for Andu

Question #176647

3. The 100g block, which moves at a speed of 4m / s, starts to brake until it stops. The work done in this case is:

A) -800 J

B) 8 J

C) 0.8J

D) -0.8J

Expert's answer

"W=\\Delta KE=mv^2\/2-mv_0^2\/2=0-0.1\\cdot4^2\/2=-0.8\\ (J)" . Answer

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