A 10 kg box initially at rest is pulled with a 50 N horizontal force for 4 m across a level surface. The force of friction acting on the box is a constant 20 N. What type of energy does the box have after it is done being pulled?
A. Elastic
B. Kinetic
C. Chemical
D. Gravitational

B kinetic

Explanation:

as the net force is 50 - 20 = 30 N, the box accelerates giving it kinetic energy

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