In this diagram there are two forces, which, when added together give a resultant force of 30 newtons (N). Resultant force = 20 N + 10 N Resultant force = 30 N to the right 2.

Since the cosine of 180 degrees is negative 1, the work done by this force is –0.11 joules. That makes the total work equal to zero joules and a change in kinetic energy of zero joules.

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